Howdy Tac– nice to see you again and I hope all is well. 🙂
Good question. There is not one-click option for an organizer to close an event, other than deleting it by logging in and removing it from their list of events (screenshot).
It’s also worth noting that once the tickets for an event have sold out, the ticket form will display a notice that the event has sold out and that no more tickets remain. That will prevent anyone from purchasing any more tickets and help you avoid overselling.
Does this help answer your question? Please let me know. 🙂
Cheers,
Geoff