[Tax-chick]

I could drop the Envirothon participants off with the team and then do an activity with the younger kids.

[Monkey Face]

I could drop the Envirothon participants off with the team and then do an activity with the younger kids.

I suspect this entire scenario would be much better for the younger offspring than trying to get them to behave under stricter rules. But two days of seeing kid-themed places might be more relaxing for you, not to mention that it will make the younger ones tired.