The recommended manner to remove an event from a Calendar is to cancel the event. Cancelling an event ensures it is updated in the RSS feed.

To cancel an event:
  1. Edit the event
  2. Mark the box for Mark Cancelled
  3. Click Save
If the event has already been deleted from Calendar or List view and needs to be removed from the RSS feed:
  1. Navigate to the Published Events
  2. Next to the event, click Delete
  3. On the prompt, click OK to confirm the deletion 
If the event is deleted from the RSS feed or Published Events and needs to be removed from Calendar view:
  1. Locate the event to delete in calendar view or list view
  2. Click the event to open it
  3. Click Edit
  4. Click Delete at the bottom of the page
  5. Click OK on the prompt