In Global Admin, you can change the status of the event by going to Events>Settings>Edit Event. Choose the new status from the drop down.
Event Status Options:
All events that are Active can be edited, and all modules can be edited
Events that are deactivated can be viewed but not edited. All the data is available for viewing and reporting.
These events are no longer available to be viewed or edited, and the data is only available as a summary.