You will need googleconfig.json, get it from here https://developers.google.com/calendar/quickstart/go
When you first start whenis it will prompt you to cennect a google calendar account.
whenis will search all calendars from the connected account for events. Both even title and description are searched. If no events are found it will also search calendar titles.
You can interact with whenis using following commands
/msg whenis -help to display this info
/msg whenis Formula 1 to search for an event (in this case F1)
/msg whenis -multi 5 Formula 1 to search for the next 5 F1 events
/msg whenis -next to show the next scheduled event
/msg whenis -ongoing to show a list of all ongoing events
/msg whenis -start 20 Session Title adds a session to the calendar with a duration of 20 minutes and the title 'Session Title' (abusing this will get you blacklisted)
/msg whenis -calendars to get a list of active calendars
All of these also work in public chat, but some will only reply with private messages