Update or delete event
Go to the calendar by clicking the "Calendar" button in the left hand menu and click on the event you wish to update.

A modal window with the event details will pop-up. It can also be accessed via the search.
info_outline Note that to be able to update or delete an event you have to be a guest or the creator of the event.
Delete event
You can delete the event by clicking the delete button at the very bottom of the form, next to the update button.
Update event
Simply change anything you want in the form and click on the update button at the bottom of the form.