D.K.
Mine have only gone in junior high or high school. Even then I'm reluctant because if they aren't very closely supervised the whole thing gets crazy fast. No one ever gets enough sleep and I have grumpy kids. I really wish they would work it more like a day camp. The kids go in the morning and come home in the evening and if another day is required then let them go back in the morning on the second day. I have spoken to my youth leader several times and finally he gave it a try and it seemed to work much better.