I think it might be regulations with our school district, but our students have to have an adult aged 21+ accompany them anywhere that isn't like the hotel or the venue.
This leads to interesting bargaining when certain groups of students want to go somewhere unique for lunch/dinner
The best one I've heard from a team is once their kids weren't going to bed at proper times, so they implemented a curfew instituted with duct tape on the outside of the door. Can't put it back on from inside!