You can delete any recurring event that you create in your personal or groups calendar.
To delete a recurring event, follow these steps:
From the My Calendar page, select the recurring event you want to modify by clicking on it. The Modify Event page appears with all the information about the event.
At the bottom of the page, click the Delete Entire Chain button. The recurring event is deleted from all instances.
Note: Once
a recurring event is deleted it cannot be recovered. After deleting the
event, you are taken back to the Calendar
view.