Thanks for all the good thoughts and tips about resources.
The Principal called today. He wanted to let me know that they are taking things seriously and taking action. To start with, they are basically redesigning the message board system and the process for planning and discussing field trips. There will be a board for parents to plan their own activities and things, but it will be clearly labeled as "non-sanctioned". The official school activities board will be overseen by staff, and only staff will be able to plan or post new events. They are still deciding what to do about these girls attending literally every activity in our area. I don't know how they even have time for their lessons. I think the school was hoping they wouldn't really have to worry about doing anything, like maybe they wouldn't attend many events. They are like the first ones to sign up for everything. He implied they have some concerns about the girls farming victims at the activities. =/ I don't think I'll really be kept in the loop on how they handle that, though. It goes a bit out of the range of what's my business, you know? He also wanted to make sure ds was comfortable with the counselor assigned, and that I was satisfied with the counselor's plan.
I'm a bit cranky about having to deal with any of this. Ds is super angry all the time and really withdrawn. He starts with the therapist tomorrow, and it's not a moment too soon.