AB 1575 is a recently enacted state law and not a constitutional amendment. The definition in the new statute is not vague but clearly states that fees may not be charged for participation in "educational" activities which are basically activities sponsored by a public school as part of the overall educational program. I recommend that you and other concerned parents meet with members of the school board. To comply with the new law, school districts and individual school facilities will need to review the activities the school sponsors, identify the education related purposes of the activities and develop plans for complying with this new rule.
I appreciate your concern about this matter however, I encourage you to work toward having the new rules interpreted in a way that encourages maximum amount of participation in school activities by all pupils. As the process of how the rules are interpreted is starting now, making your concerns known in a thoughtful way to the decision makers (i.e. the school board and school administrators) is the most effective way of insuring fairness to all children.