You can delete an event as needed.
To delete an event
How to get there
On the Schedule menu, click (or tap) Calendar.
The Calendar page opens.
On the Calendar page, click (or tap) an event.
If the event is a recurring event, the Recurring Event dialog box appears. Otherwise, skip step 2.
Click (or tap) Series or This Occurrence.
The Event Information panel opens.
Click (or tap) Delete.