Wooooo,
I just had an idea.
Each team is required to have a one evening seiminar for the parents with the team and coaches on the field. Make it a Sat evening before the season starts. Combine it with the team meeting. Show what is a foul (and not), explain off sides, dangerous kick, direct, indirect, yellow, red, as much as you can, have a local ref come out and help. Even expalin game stratigy, where we are with the program, goals,