When you delete an event, you can still see it in the Google Calendar trash folder for 30 days before it is permanently deleted automatically. Permanently deleted events can’t be restored. Therefore, be sure of your actions before taking this path. It can’t be undone. There is also an option where you can clear the trash bin yourself manually. • Hover over a single event and click the trash icon to delete it permanently. • Check the event boxes of all events you want to delete, and then click “Trash” at the top. • Delete all events at once by tapping “Empty Trash” followed by “Empty” to confirm.