Your calendar events can be changed or deleted at any time.
To edit or delete an event, navigate to the event date and click on the event. This will open a small window where the Edit or Delete button will be displayed.
Selecting Edit will open the Event detail window where information can be edited and 'updated' by clicking on Update Visit at the bottom of the page.
Selecting 'Delete' will open a window to confirm you intend to remove the event.