Administrators have the ability to delete events at any time. Deleted events will be entirely removed from the Events page, and cannot be re-enabled.
If you would like for the event to still appear but alert your participants that it's not being held, you may cancel the event instead.
To delete an event, first find your event either on the Events or Course Catalog pages, then Edit it.
At the very end of the Edit page there is a Delete button. Simply click Delete to remove your event.