Once VBS is over, don't forget to follow up with people who attended! Try these options:
Send a follow-up email to all the attendees.
Create any reports you might need.
Clean up your applications by archiving your event, service type, and setting people to inactive.
Since there are never any contracts for using Planning Center applications, you can downgrade the subscription of any of the applications you were using if you no longer need them. All the information will stay in the application in case you need it in the future as long as you're still subscribed!