Ideally, you should make all your event related objects as Simbojects, so you can show them only during event (within a specific time frame/date), this doesn’t require user input or user interaction deleting files.
Or
You can add a specific bgl asset group in your package where you can place event specific objects, call that even.bgl
The tell the user to disable that bgl (basically renaming to something like event.bak) when the event is not in place