Delete a Calendar
You can delete any calendar in your Calendars list, except your default calendar. When you delete a calendar, the meetings created from this calendar are not deleted from the calendars of the invited attendees.
Before you delete a calendar, you should cancel any invitations that you have sent out.
In the Calendars Overview pane, right-click on the calendar to be deleted.
Click Delete. The calendar is moved to the Trash folder.