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