What a waste of time.  It is a classic example of confusing a "knowledge gap" with a "discipline gap".   This approach assumes that if parents only knew their behaviour was unacceptable, then they wouldn't engage in that behaviour.  This is incredibly naive.  

If you want to solve the problem, you simply have a zero-tolerance policy.  If you're caught out of line once, you're banned from the arena for a month.   Twice... gone for the season.   If it happens again the following season, you're banned from the arena for life.