diff --git a/runtime/common/src/auctions.rs b/runtime/common/src/auctions.rs
index e7c8f466f5c8..2d71fd432d0f 100644
--- a/runtime/common/src/auctions.rs
+++ b/runtime/common/src/auctions.rs
@@ -128,25 +128,31 @@ pub mod pallet {
 	pub enum Event<T: Config> {
 		/// An auction started. Provides its index and the block number where it will begin to
 		/// close and the first lease period of the quadruplet that is auctioned.
-		/// `[auction_index, lease_period, ending]`
-		AuctionStarted(AuctionIndex, LeasePeriodOf<T>, T::BlockNumber),
-		/// An auction ended. All funds become unreserved. `[auction_index]`
-		AuctionClosed(AuctionIndex),
+		AuctionStarted {
+			auction_index: AuctionIndex,
+			lease_period: LeasePeriodOf<T>,
+			ending: T::BlockNumber,
+		},
+		/// An auction ended. All funds become unreserved.
+		AuctionClosed { auction_index: AuctionIndex },
 		/// Funds were reserved for a winning bid. First balance is the extra amount reserved.
-		/// Second is the total. `[bidder, extra_reserved, total_amount]`
-		Reserved(T::AccountId, BalanceOf<T>, BalanceOf<T>),
+		/// Second is the total.
+		Reserved { bidder: T::AccountId, extra_reserved: BalanceOf<T>, total_amount: BalanceOf<T> },
 		/// Funds were unreserved since bidder is no longer active. `[bidder, amount]`
-		Unreserved(T::AccountId, BalanceOf<T>),
+		Unreserved { bidder: T::AccountId, amount: BalanceOf<T> },
 		/// Someone attempted to lease the same slot twice for a parachain. The amount is held in reserve
 		/// but no parachain slot has been leased.
-		/// `[parachain_id, leaser, amount]`
-		ReserveConfiscated(ParaId, T::AccountId, BalanceOf<T>),
+		ReserveConfiscated { para_id: ParaId, leaser: T::AccountId, amount: BalanceOf<T> },
 		/// A new bid has been accepted as the current winner.
-		/// `[who, para_id, amount, first_slot, last_slot]`
-		BidAccepted(T::AccountId, ParaId, BalanceOf<T>, LeasePeriodOf<T>, LeasePeriodOf<T>),
+		BidAccepted {
+			bidder: T::AccountId,
+			para_id: ParaId,
+			amount: BalanceOf<T>,
+			first_slot: LeasePeriodOf<T>,
+			last_slot: LeasePeriodOf<T>,
+		},
 		/// The winning offset was chosen for an auction. This will map into the `Winning` storage map.
-		/// `[auction_index, block_number]`
-		WinningOffset(AuctionIndex, T::BlockNumber),
+		WinningOffset { auction_index: AuctionIndex, block_number: T::BlockNumber },
 	}
 
 	#[pallet::error]
@@ -397,7 +403,11 @@ impl<T: Config> Pallet<T> {
 		let ending = frame_system::Pallet::<T>::block_number().saturating_add(duration);
 		AuctionInfo::<T>::put((lease_period_index, ending));
 
-		Self::deposit_event(Event::<T>::AuctionStarted(n, lease_period_index, ending));
+		Self::deposit_event(Event::<T>::AuctionStarted {
+			auction_index: n,
+			lease_period: lease_period_index,
+			ending,
+		});
 		Ok(())
 	}
 
@@ -472,11 +482,11 @@ impl<T: Config> Pallet<T> {
 				// ...and record the amount reserved.
 				ReservedAmounts::<T>::insert(&bidder_para, reserve_required);
 
-				Self::deposit_event(Event::<T>::Reserved(
-					bidder.clone(),
-					additional,
-					reserve_required,
-				));
+				Self::deposit_event(Event::<T>::Reserved {
+					bidder: bidder.clone(),
+					extra_reserved: additional,
+					total_amount: reserve_required,
+				});
 			}
 
 			// Return any funds reserved for the previous winner if we are not in the ending period
@@ -495,16 +505,20 @@ impl<T: Config> Pallet<T> {
 						// It really should be reserved; there's not much we can do here on fail.
 						let err_amt = CurrencyOf::<T>::unreserve(&who, amount);
 						debug_assert!(err_amt.is_zero());
-						Self::deposit_event(Event::<T>::Unreserved(who, amount));
+						Self::deposit_event(Event::<T>::Unreserved { bidder: who, amount });
 					}
 				}
 			}
 
 			// Update the range winner.
 			Winning::<T>::insert(offset, &current_winning);
-			Self::deposit_event(Event::<T>::BidAccepted(
-				bidder, para, amount, first_slot, last_slot,
-			));
+			Self::deposit_event(Event::<T>::BidAccepted {
+				bidder,
+				para_id: para,
+				amount,
+				first_slot,
+				last_slot,
+			});
 		}
 		Ok(())
 	}
@@ -535,7 +549,10 @@ impl<T: Config> Pallet<T> {
 						T::SampleLength::get().max(One::one());
 
 					let auction_counter = AuctionCounter::<T>::get();
-					Self::deposit_event(Event::<T>::WinningOffset(auction_counter, offset));
+					Self::deposit_event(Event::<T>::WinningOffset {
+						auction_index: auction_counter,
+						block_number: offset,
+					});
 					let res = Winning::<T>::get(offset)
 						.unwrap_or([Self::EMPTY; SlotRange::SLOT_RANGE_COUNT]);
 					// This `remove_all` statement should remove at most `EndingPeriod` / `SampleLength` items,
@@ -585,14 +602,20 @@ impl<T: Config> Pallet<T> {
 					// The leaser attempted to get a second lease on the same para ID, possibly griefing us. Let's
 					// keep the amount reserved and let governance sort it out.
 					if CurrencyOf::<T>::reserve(&leaser, amount).is_ok() {
-						Self::deposit_event(Event::<T>::ReserveConfiscated(para, leaser, amount));
+						Self::deposit_event(Event::<T>::ReserveConfiscated {
+							para_id: para,
+							leaser,
+							amount,
+						});
 					}
 				},
 				Ok(()) => {}, // Nothing to report.
 			}
 		}
 
-		Self::deposit_event(Event::<T>::AuctionClosed(AuctionCounter::<T>::get()));
+		Self::deposit_event(Event::<T>::AuctionClosed {
+			auction_index: AuctionCounter::<T>::get(),
+		});
 	}
 
 	/// Calculate the final winners from the winning slots.
@@ -1763,11 +1786,11 @@ mod benchmarking {
 			let origin = T::InitiateOrigin::successful_origin();
 		}: _(RawOrigin::Root, duration, lease_period_index)
 		verify {
-			assert_last_event::<T>(Event::<T>::AuctionStarted(
-				AuctionCounter::<T>::get(),
-				LeasePeriodOf::<T>::max_value(),
-				T::BlockNumber::max_value(),
-			).into());
+			assert_last_event::<T>(Event::<T>::AuctionStarted {
+				auction_index: AuctionCounter::<T>::get(),
+				lease_period: LeasePeriodOf::<T>::max_value(),
+				ending: T::BlockNumber::max_value(),
+			}.into());
 		}
 
 		// Worst case scenario a new bid comes in which kicks out an existing bid for the same slot.
@@ -1859,7 +1882,7 @@ mod benchmarking {
 			Auctions::<T>::on_initialize(duration + now + T::EndingPeriod::get());
 		} verify {
 			let auction_index = AuctionCounter::<T>::get();
-			assert_last_event::<T>(Event::<T>::AuctionClosed(auction_index).into());
+			assert_last_event::<T>(Event::<T>::AuctionClosed { auction_index }.into());
 			assert!(Winning::<T>::iter().count().is_zero());
 		}
 
diff --git a/runtime/common/src/claims.rs b/runtime/common/src/claims.rs
index f22b6636c33c..e2731f9336cc 100644
--- a/runtime/common/src/claims.rs
+++ b/runtime/common/src/claims.rs
@@ -183,8 +183,8 @@ pub mod pallet {
 	#[pallet::event]
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config> {
-		/// Someone claimed some DOTs. `[who, ethereum_address, amount]`
-		Claimed(T::AccountId, EthereumAddress, BalanceOf<T>),
+		/// Someone claimed some DOTs.
+		Claimed { who: T::AccountId, ethereum_address: EthereumAddress, amount: BalanceOf<T> },
 	}
 
 	#[pallet::error]
@@ -581,7 +581,11 @@ impl<T: Config> Pallet<T> {
 		Signing::<T>::remove(&signer);
 
 		// Let's deposit an event to let the outside world know this happened.
-		Self::deposit_event(Event::<T>::Claimed(dest, signer, balance_due));
+		Self::deposit_event(Event::<T>::Claimed {
+			who: dest,
+			ethereum_address: signer,
+			amount: balance_due,
+		});
 
 		Ok(())
 	}
diff --git a/runtime/common/src/crowdloan/mod.rs b/runtime/common/src/crowdloan/mod.rs
index e48b1b51b818..bbb74c634ade 100644
--- a/runtime/common/src/crowdloan/mod.rs
+++ b/runtime/common/src/crowdloan/mod.rs
@@ -254,27 +254,27 @@ pub mod pallet {
 	#[pallet::event]
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config> {
-		/// Create a new crowdloaning campaign. `[fund_index]`
-		Created(ParaId),
-		/// Contributed to a crowd sale. `[who, fund_index, amount]`
-		Contributed(T::AccountId, ParaId, BalanceOf<T>),
-		/// Withdrew full balance of a contributor. `[who, fund_index, amount]`
-		Withdrew(T::AccountId, ParaId, BalanceOf<T>),
+		/// Create a new crowdloaning campaign.
+		Created { para_id: ParaId },
+		/// Contributed to a crowd sale.
+		Contributed { who: T::AccountId, fund_index: ParaId, amount: BalanceOf<T> },
+		/// Withdrew full balance of a contributor.
+		Withdrew { who: T::AccountId, fund_index: ParaId, amount: BalanceOf<T> },
 		/// The loans in a fund have been partially dissolved, i.e. there are some left
-		/// over child keys that still need to be killed. `[fund_index]`
-		PartiallyRefunded(ParaId),
-		/// All loans in a fund have been refunded. `[fund_index]`
-		AllRefunded(ParaId),
-		/// Fund is dissolved. `[fund_index]`
-		Dissolved(ParaId),
+		/// over child keys that still need to be killed.
+		PartiallyRefunded { para_id: ParaId },
+		/// All loans in a fund have been refunded.
+		AllRefunded { para_id: ParaId },
+		/// Fund is dissolved.
+		Dissolved { para_id: ParaId },
 		/// The result of trying to submit a new bid to the Slots pallet.
-		HandleBidResult(ParaId, DispatchResult),
-		/// The configuration to a crowdloan has been edited. `[fund_index]`
-		Edited(ParaId),
-		/// A memo has been updated. `[who, fund_index, memo]`
-		MemoUpdated(T::AccountId, ParaId, Vec<u8>),
+		HandleBidResult { para_id: ParaId, result: DispatchResult },
+		/// The configuration to a crowdloan has been edited.
+		Edited { para_id: ParaId },
+		/// A memo has been updated.
+		MemoUpdated { who: T::AccountId, para_id: ParaId, memo: Vec<u8> },
 		/// A parachain has been moved to `NewRaise`
-		AddedToNewRaise(ParaId),
+		AddedToNewRaise { para_id: ParaId },
 	}
 
 	#[pallet::error]
@@ -351,7 +351,7 @@ pub mod pallet {
 						fund.raised,
 					);
 
-					Self::deposit_event(Event::<T>::HandleBidResult(para_id, result));
+					Self::deposit_event(Event::<T>::HandleBidResult { para_id, result });
 				}
 				T::WeightInfo::on_initialize(new_raise_len)
 			} else {
@@ -437,7 +437,7 @@ pub mod pallet {
 			// Add a lock to the para so that the configuration cannot be changed.
 			T::Registrar::apply_lock(index);
 
-			Self::deposit_event(Event::<T>::Created(index));
+			Self::deposit_event(Event::<T>::Created { para_id: index });
 			Ok(())
 		}
 
@@ -494,7 +494,7 @@ pub mod pallet {
 
 			Funds::<T>::insert(index, &fund);
 
-			Self::deposit_event(Event::<T>::Withdrew(who, index, balance));
+			Self::deposit_event(Event::<T>::Withdrew { who, fund_index: index, amount: balance });
 			Ok(())
 		}
 
@@ -536,11 +536,11 @@ pub mod pallet {
 			Funds::<T>::insert(index, &fund);
 
 			if all_refunded {
-				Self::deposit_event(Event::<T>::AllRefunded(index));
+				Self::deposit_event(Event::<T>::AllRefunded { para_id: index });
 				// Refund for unused refund count.
 				Ok(Some(T::WeightInfo::refund(refund_count)).into())
 			} else {
-				Self::deposit_event(Event::<T>::PartiallyRefunded(index));
+				Self::deposit_event(Event::<T>::PartiallyRefunded { para_id: index });
 				// No weight to refund since we did not finish the loop.
 				Ok(().into())
 			}
@@ -567,7 +567,7 @@ pub mod pallet {
 
 			CurrencyOf::<T>::unreserve(&fund.depositor, fund.deposit);
 			Funds::<T>::remove(index);
-			Self::deposit_event(Event::<T>::Dissolved(index));
+			Self::deposit_event(Event::<T>::Dissolved { para_id: index });
 			Ok(())
 		}
 
@@ -604,7 +604,7 @@ pub mod pallet {
 				},
 			);
 
-			Self::deposit_event(Event::<T>::Edited(index));
+			Self::deposit_event(Event::<T>::Edited { para_id: index });
 			Ok(())
 		}
 
@@ -622,7 +622,7 @@ pub mod pallet {
 			ensure!(balance > Zero::zero(), Error::<T>::NoContributions);
 
 			Self::contribution_put(fund.fund_index, &who, &balance, &memo);
-			Self::deposit_event(Event::<T>::MemoUpdated(who, index, memo));
+			Self::deposit_event(Event::<T>::MemoUpdated { who, para_id: index, memo });
 			Ok(())
 		}
 
@@ -636,7 +636,7 @@ pub mod pallet {
 			ensure!(!fund.raised.is_zero(), Error::<T>::NoContributions);
 			ensure!(!NewRaise::<T>::get().contains(&index), Error::<T>::AlreadyInNewRaise);
 			NewRaise::<T>::append(index);
-			Self::deposit_event(Event::<T>::AddedToNewRaise(index));
+			Self::deposit_event(Event::<T>::AddedToNewRaise { para_id: index });
 			Ok(())
 		}
 
@@ -810,7 +810,7 @@ impl<T: Config> Pallet<T> {
 
 		Funds::<T>::insert(index, &fund);
 
-		Self::deposit_event(Event::<T>::Contributed(who, index, value));
+		Self::deposit_event(Event::<T>::Contributed { who, fund_index: index, amount: value });
 		Ok(())
 	}
 }
@@ -1648,14 +1648,17 @@ mod tests {
 			// Move to the end of the crowdloan
 			run_to_block(10);
 			assert_ok!(Crowdloan::refund(Origin::signed(1337), para));
-			assert_eq!(last_event(), super::Event::<Test>::PartiallyRefunded(para).into());
+			assert_eq!(
+				last_event(),
+				super::Event::<Test>::PartiallyRefunded { para_id: para }.into()
+			);
 
 			// Funds still left over
 			assert!(!Balances::free_balance(account_id).is_zero());
 
 			// Call again
 			assert_ok!(Crowdloan::refund(Origin::signed(1337), para));
-			assert_eq!(last_event(), super::Event::<Test>::AllRefunded(para).into());
+			assert_eq!(last_event(), super::Event::<Test>::AllRefunded { para_id: para }.into());
 
 			// Funds are returned
 			assert_eq!(Balances::free_balance(account_id), 0);
@@ -1983,7 +1986,7 @@ mod benchmarking {
 
 		}: _(RawOrigin::Signed(caller), para_id, cap, first_period, last_period, end, Some(verifier))
 		verify {
-			assert_last_event::<T>(Event::<T>::Created(para_id).into())
+			assert_last_event::<T>(Event::<T>::Created { para_id }.into())
 		}
 
 		// Contribute has two arms: PreEnding and Ending, but both are equal complexity.
@@ -2004,7 +2007,7 @@ mod benchmarking {
 		verify {
 			// NewRaise is appended to, so we don't need to fill it up for worst case scenario.
 			assert!(!NewRaise::<T>::get().is_empty());
-			assert_last_event::<T>(Event::<T>::Contributed(caller, fund_index, contribution).into());
+			assert_last_event::<T>(Event::<T>::Contributed { who: caller, fund_index, amount: contribution }.into());
 		}
 
 		withdraw {
@@ -2017,7 +2020,7 @@ mod benchmarking {
 			frame_system::Pallet::<T>::set_block_number(T::BlockNumber::max_value());
 		}: _(RawOrigin::Signed(caller), contributor.clone(), fund_index)
 		verify {
-			assert_last_event::<T>(Event::<T>::Withdrew(contributor, fund_index, T::MinContribution::get()).into());
+			assert_last_event::<T>(Event::<T>::Withdrew { who: contributor, fund_index, amount: T::MinContribution::get() }.into());
 		}
 
 		// Worst case: Refund removes `RemoveKeysLimit` keys, and is fully refunded.
@@ -2037,7 +2040,7 @@ mod benchmarking {
 			frame_system::Pallet::<T>::set_block_number(T::BlockNumber::max_value());
 		}: _(RawOrigin::Signed(caller), fund_index)
 		verify {
-			assert_last_event::<T>(Event::<T>::AllRefunded(fund_index).into());
+			assert_last_event::<T>(Event::<T>::AllRefunded { para_id: fund_index }.into());
 		}
 
 		dissolve {
@@ -2048,7 +2051,7 @@ mod benchmarking {
 			frame_system::Pallet::<T>::set_block_number(T::BlockNumber::max_value());
 		}: _(RawOrigin::Signed(caller.clone()), fund_index)
 		verify {
-			assert_last_event::<T>(Event::<T>::Dissolved(fund_index).into());
+			assert_last_event::<T>(Event::<T>::Dissolved { para_id: fund_index }.into());
 		}
 
 		edit {
@@ -2077,7 +2080,7 @@ mod benchmarking {
 			// Doesn't matter what we edit to, so use the same values.
 		}: _(RawOrigin::Root, para_id, cap, first_period, last_period, end, Some(verifier))
 		verify {
-			assert_last_event::<T>(Event::<T>::Edited(para_id).into())
+			assert_last_event::<T>(Event::<T>::Edited { para_id }.into())
 		}
 
 		add_memo {
@@ -2107,7 +2110,7 @@ mod benchmarking {
 		}: _(RawOrigin::Signed(caller), fund_index)
 		verify {
 			assert!(!NewRaise::<T>::get().is_empty());
-			assert_last_event::<T>(Event::<T>::AddedToNewRaise(fund_index).into())
+			assert_last_event::<T>(Event::<T>::AddedToNewRaise { para_id: fund_index }.into())
 		}
 
 		// Worst case scenario: N funds are all in the `NewRaise` list, we are
@@ -2146,7 +2149,7 @@ mod benchmarking {
 			Crowdloan::<T>::on_initialize(end_block);
 		} verify {
 			assert_eq!(EndingsCount::<T>::get(), old_endings_count + 1);
-			assert_last_event::<T>(Event::<T>::HandleBidResult((n - 1).into(), Ok(())).into());
+			assert_last_event::<T>(Event::<T>::HandleBidResult { para_id: (n - 1).into(), result: Ok(()) }.into());
 		}
 
 		impl_benchmark_test_suite!(
diff --git a/runtime/common/src/integration_tests.rs b/runtime/common/src/integration_tests.rs
index 7ff7afe4fdf2..76dc1f4c55b0 100644
--- a/runtime/common/src/integration_tests.rs
+++ b/runtime/common/src/integration_tests.rs
@@ -432,10 +432,17 @@ fn basic_end_to_end_works() {
 			// Auction ends at block 110 + offset
 			run_to_block(109 + offset);
 			assert!(contains_event(
-				crowdloan::Event::<Test>::HandleBidResult(ParaId::from(para_2), Ok(())).into()
+				crowdloan::Event::<Test>::HandleBidResult {
+					para_id: ParaId::from(para_2),
+					result: Ok(())
+				}
+				.into()
 			));
 			run_to_block(110 + offset);
-			assert_eq!(last_event(), auctions::Event::<Test>::AuctionClosed(1).into());
+			assert_eq!(
+				last_event(),
+				auctions::Event::<Test>::AuctionClosed { auction_index: 1 }.into()
+			);
 
 			// Paras should have won slots
 			assert_eq!(
diff --git a/runtime/common/src/paras_registrar.rs b/runtime/common/src/paras_registrar.rs
index 59806e0cf639..7631914b9992 100644
--- a/runtime/common/src/paras_registrar.rs
+++ b/runtime/common/src/paras_registrar.rs
@@ -127,9 +127,9 @@ pub mod pallet {
 	#[pallet::event]
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config> {
-		Registered(ParaId, T::AccountId),
-		Deregistered(ParaId),
-		Reserved(ParaId, T::AccountId),
+		Registered { para_id: ParaId, manager: T::AccountId },
+		Deregistered { para_id: ParaId },
+		Reserved { para_id: ParaId, who: T::AccountId },
 	}
 
 	#[pallet::error]
@@ -492,7 +492,7 @@ impl<T: Config> Pallet<T> {
 		let info = ParaInfo { manager: who.clone(), deposit, locked: false };
 
 		Paras::<T>::insert(id, info);
-		Self::deposit_event(Event::<T>::Reserved(id, who));
+		Self::deposit_event(Event::<T>::Reserved { para_id: id, who });
 		Ok(())
 	}
 
@@ -530,7 +530,7 @@ impl<T: Config> Pallet<T> {
 		// We check above that para has no lifecycle, so this should not fail.
 		let res = runtime_parachains::schedule_para_initialize::<T>(id, genesis);
 		debug_assert!(res.is_ok());
-		Self::deposit_event(Event::<T>::Registered(id, who));
+		Self::deposit_event(Event::<T>::Registered { para_id: id, manager: who });
 		Ok(())
 	}
 
@@ -549,7 +549,7 @@ impl<T: Config> Pallet<T> {
 		}
 
 		PendingSwap::<T>::remove(id);
-		Self::deposit_event(Event::<T>::Deregistered(id));
+		Self::deposit_event(Event::<T>::Deregistered { para_id: id });
 		Ok(())
 	}
 
@@ -1268,7 +1268,7 @@ mod benchmarking {
 			T::Currency::make_free_balance_be(&caller, BalanceOf::<T>::max_value());
 		}: _(RawOrigin::Signed(caller.clone()))
 		verify {
-			assert_last_event::<T>(Event::<T>::Reserved(LOWEST_PUBLIC_ID, caller).into());
+			assert_last_event::<T>(Event::<T>::Reserved { para_id: LOWEST_PUBLIC_ID, who: caller }.into());
 			assert!(Paras::<T>::get(LOWEST_PUBLIC_ID).is_some());
 			assert_eq!(paras::Pallet::<T>::lifecycle(LOWEST_PUBLIC_ID), None);
 		}
@@ -1282,7 +1282,7 @@ mod benchmarking {
 			assert_ok!(Registrar::<T>::reserve(RawOrigin::Signed(caller.clone()).into()));
 		}: _(RawOrigin::Signed(caller.clone()), para, genesis_head, validation_code)
 		verify {
-			assert_last_event::<T>(Event::<T>::Registered(para, caller).into());
+			assert_last_event::<T>(Event::<T>::Registered{ para_id: para, manager: caller }.into());
 			assert_eq!(paras::Pallet::<T>::lifecycle(para), Some(ParaLifecycle::Onboarding));
 			next_scheduled_session::<T>();
 			assert_eq!(paras::Pallet::<T>::lifecycle(para), Some(ParaLifecycle::Parathread));
@@ -1296,7 +1296,7 @@ mod benchmarking {
 			let validation_code = Registrar::<T>::worst_validation_code();
 		}: _(RawOrigin::Root, manager.clone(), deposit, para, genesis_head, validation_code)
 		verify {
-			assert_last_event::<T>(Event::<T>::Registered(para, manager).into());
+			assert_last_event::<T>(Event::<T>::Registered { para_id: para, manager }.into());
 			assert_eq!(paras::Pallet::<T>::lifecycle(para), Some(ParaLifecycle::Onboarding));
 			next_scheduled_session::<T>();
 			assert_eq!(paras::Pallet::<T>::lifecycle(para), Some(ParaLifecycle::Parathread));
@@ -1308,7 +1308,7 @@ mod benchmarking {
 			let caller: T::AccountId = whitelisted_caller();
 		}: _(RawOrigin::Signed(caller), para)
 		verify {
-			assert_last_event::<T>(Event::<T>::Deregistered(para).into());
+			assert_last_event::<T>(Event::<T>::Deregistered { para_id: para }.into());
 		}
 
 		swap {
diff --git a/runtime/common/src/purchase.rs b/runtime/common/src/purchase.rs
index 9e8bd2c9081f..b534e2277059 100644
--- a/runtime/common/src/purchase.rs
+++ b/runtime/common/src/purchase.rs
@@ -133,19 +133,19 @@ pub mod pallet {
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config> {
 		/// A [new] account was created.
-		AccountCreated(T::AccountId),
-		/// Someone's account validity was updated. [who, validity]
-		ValidityUpdated(T::AccountId, AccountValidity),
-		/// Someone's purchase balance was updated. [who, free, locked]
-		BalanceUpdated(T::AccountId, BalanceOf<T>, BalanceOf<T>),
-		/// A payout was made to a purchaser. [who, free, locked]
-		PaymentComplete(T::AccountId, BalanceOf<T>, BalanceOf<T>),
-		/// A new payment account was set. [who]
-		PaymentAccountSet(T::AccountId),
+		AccountCreated { who: T::AccountId },
+		/// Someone's account validity was updated.
+		ValidityUpdated { who: T::AccountId, validity: AccountValidity },
+		/// Someone's purchase balance was updated.
+		BalanceUpdated { who: T::AccountId, free: BalanceOf<T>, locked: BalanceOf<T> },
+		/// A payout was made to a purchaser.
+		PaymentComplete { who: T::AccountId, free: BalanceOf<T>, locked: BalanceOf<T> },
+		/// A new payment account was set.
+		PaymentAccountSet { who: T::AccountId },
 		/// A new statement was set.
 		StatementUpdated,
 		/// A new statement was set. `[block_number]`
-		UnlockBlockUpdated(T::BlockNumber),
+		UnlockBlockUpdated { block_number: T::BlockNumber },
 	}
 
 	#[pallet::error]
@@ -222,7 +222,7 @@ pub mod pallet {
 				vat: Permill::zero(),
 			};
 			Accounts::<T>::insert(&who, status);
-			Self::deposit_event(Event::<T>::AccountCreated(who));
+			Self::deposit_event(Event::<T>::AccountCreated { who });
 			Ok(())
 		}
 
@@ -251,7 +251,7 @@ pub mod pallet {
 					Ok(())
 				},
 			)?;
-			Self::deposit_event(Event::<T>::ValidityUpdated(who, validity));
+			Self::deposit_event(Event::<T>::ValidityUpdated { who, validity });
 			Ok(())
 		}
 
@@ -283,7 +283,11 @@ pub mod pallet {
 					Ok(())
 				},
 			)?;
-			Self::deposit_event(Event::<T>::BalanceUpdated(who, free_balance, locked_balance));
+			Self::deposit_event(Event::<T>::BalanceUpdated {
+				who,
+				free: free_balance,
+				locked: locked_balance,
+			});
 			Ok(())
 		}
 
@@ -346,11 +350,11 @@ pub mod pallet {
 
 					// Setting the user account to `Completed` ends the purchase process for this user.
 					status.validity = AccountValidity::Completed;
-					Self::deposit_event(Event::<T>::PaymentComplete(
-						who.clone(),
-						status.free_balance,
-						status.locked_balance,
-					));
+					Self::deposit_event(Event::<T>::PaymentComplete {
+						who: who.clone(),
+						free: status.free_balance,
+						locked: status.locked_balance,
+					});
 					Ok(())
 				},
 			)?;
@@ -367,7 +371,7 @@ pub mod pallet {
 			T::ConfigurationOrigin::ensure_origin(origin)?;
 			// Possibly this is worse than having the caller account be the payment account?
 			PaymentAccount::<T>::put(who.clone());
-			Self::deposit_event(Event::<T>::PaymentAccountSet(who));
+			Self::deposit_event(Event::<T>::PaymentAccountSet { who });
 			Ok(())
 		}
 
@@ -402,7 +406,7 @@ pub mod pallet {
 			);
 			// Possibly this is worse than having the caller account be the payment account?
 			UnlockBlock::<T>::set(unlock_block);
-			Self::deposit_event(Event::<T>::UnlockBlockUpdated(unlock_block));
+			Self::deposit_event(Event::<T>::UnlockBlockUpdated { block_number: unlock_block });
 			Ok(())
 		}
 	}
diff --git a/runtime/common/src/slots/mod.rs b/runtime/common/src/slots/mod.rs
index 3796c3330c3a..1b76e508dadf 100644
--- a/runtime/common/src/slots/mod.rs
+++ b/runtime/common/src/slots/mod.rs
@@ -122,19 +122,18 @@ pub mod pallet {
 	#[pallet::generate_deposit(pub(super) fn deposit_event)]
 	pub enum Event<T: Config> {
 		/// A new `[lease_period]` is beginning.
-		NewLeasePeriod(LeasePeriodOf<T>),
+		NewLeasePeriod { lease_period: LeasePeriodOf<T> },
 		/// A para has won the right to a continuous set of lease periods as a parachain.
 		/// First balance is any extra amount reserved on top of the para's existing deposit.
 		/// Second balance is the total amount reserved.
-		/// `[parachain_id, leaser, period_begin, period_count, extra_reserved, total_amount]`
-		Leased(
-			ParaId,
-			T::AccountId,
-			LeasePeriodOf<T>,
-			LeasePeriodOf<T>,
-			BalanceOf<T>,
-			BalanceOf<T>,
-		),
+		Leased {
+			para_id: ParaId,
+			leaser: T::AccountId,
+			period_begin: LeasePeriodOf<T>,
+			period_count: LeasePeriodOf<T>,
+			extra_reserved: BalanceOf<T>,
+			total_amount: BalanceOf<T>,
+		},
 	}
 
 	#[pallet::error]
@@ -228,7 +227,7 @@ impl<T: Config> Pallet<T> {
 	/// We need to on-board and off-board parachains as needed. We should also handle reducing/
 	/// returning deposits.
 	fn manage_lease_period_start(lease_period_index: LeasePeriodOf<T>) -> Weight {
-		Self::deposit_event(Event::<T>::NewLeasePeriod(lease_period_index));
+		Self::deposit_event(Event::<T>::NewLeasePeriod { lease_period: lease_period_index });
 
 		let old_parachains = T::Registrar::parachains();
 
@@ -408,14 +407,14 @@ impl<T: Config> Leaser<T::BlockNumber> for Pallet<T> {
 				let _ = T::Registrar::make_parachain(para);
 			}
 
-			Self::deposit_event(Event::<T>::Leased(
-				para,
-				leaser.clone(),
+			Self::deposit_event(Event::<T>::Leased {
+				para_id: para,
+				leaser: leaser.clone(),
 				period_begin,
 				period_count,
-				reserved,
-				amount,
-			));
+				extra_reserved: reserved,
+				total_amount: amount,
+			});
 
 			Ok(())
 		})
@@ -1027,7 +1026,13 @@ mod benchmarking {
 			let period_count = 3u32.into();
 		}: _(RawOrigin::Root, para, leaser.clone(), amount, period_begin, period_count)
 		verify {
-			assert_last_event::<T>(Event::<T>::Leased(para, leaser, period_begin, period_count, amount, amount).into());
+			assert_last_event::<T>(Event::<T>::Leased {
+				para_id: para,
+				leaser, period_begin,
+				period_count,
+				extra_reserved: amount,
+				total_amount: amount,
+			}.into());
 		}
 
 		// Worst case scenario, T parathreads onboard, and C parachains offboard.