Small controlled groups (1 or 2 kids at a time) with pointing dogs only. Will they be releasing birds for the hunt? If so, just release a few birds into the field before each small group hunts the field.
Wild bird hunt with a large group of kids? NO WAY!!!!!!!!!! It just isn't safe.
I would require some observed clay shooting before allowing the kids in the field just to make sure that have a good understanding of firearm safety. I would have to feel secure with the hunters before I ever released my dogs around ANY new or inexperienced upland hunter.
I won't hunt with large groups of adults, I certainly would not hunt with a large group of kids. I would not let my son hunt with a large group of other kids. I would also assign an experienced upland hunter with each kid. It sounds like most of the parents would not be accustomed to hunting upland birds either.
I mostly hunted wild pheasant before moving to Texas two years ago. Pheasant are incredibly difficult to hunt with pointing dogs; which is why it is so much fun!
Here is a picture of my son when he was younger, notice his toy shotgun
. Pheasant hunting in Montana.