This function allows you to remove events from a calendar.
1. Right-click the event you want to delete, then click Delete from the drop-down menu.
2. Click OK in the confirmation message to accept your deletion.
Delete an event in the Month view
1. Tick the checkboxes corresponding to the events you want to delete.
2. Click 
on the Month information bar.
3. Click OK in the confirmation message to accept your deletion.
Note
For shared and group calendars, you can only delete their events if you have the Edit permission on these calendars.