I seem to remember that you had similar problems last year that you posted on here about?
Is it possible to get a temporary ATZ for the event to ensure that anyone passing through at least had to make contact to get info on traffic already in the ATZ?
Then if someone came through without making contact they would have at least broken a rule, and some reeducation could be enforced.
I agree with those suggesting you call the pilots. Posting a rant on here again this year, while ignoring the pilots achieves nothing.