Last month I had a spreadsheet with ~40 shifts — date, start, end, who's on call — and needed them in Google Calendar. The obvious route is Google's CSV import. It exists, and it half-works: dates get parsed US-style ( 03/04 is March 4th whether you meant that or not), there's no timezone colum...
Source: [Dev.to](https://dev.to/caseymarlin/bulk-adding-events-to-a-calendar-app-the-ics-format-from-scratch-578g)