Hide an event from the calendar
To hide an event from the full calendar display - yet keep it visible in an event list - navigate to your Event in the Events module and click "Publish" in the sidebar to visit the Publish screen.
Here you can uncheck the checkbox, "Show in calendars?" to hide it from the calendar view.
If you will need to hide many events from the Calendar and would rather only show featured events there or apply another filter, contact Support for help adding that filter.