I have a group of 10 kids (8 family members + 2 friends) and we signed up for Properties of Motion for September 12 at 7:15. If you are interested in signing up with us, you could go ahead & start your planning now. I'm not really sure about the chaperone thing, though. It says 1 adult is required for every 5 children, so I would assume you would need (only be able to have) a 3rd chaperone for the 11-15th kids. My SIL & I will be the first 2 chaperones.
I emailed about this because one of our 9 kids would be 7 & we wanted to let her in with the other 8 kids in the family. They emailed me this response:
"We are unfortunately not able to allow the 7 year old on the program. This program does require that the students be a minimum of 8 years old since they do go into the park before it opens and this is considered a backstage experience. Also, your program will be taught to the age range that is most prevalent in your group (high school student range), so a 7 year old would not really enjoy the experience. We just want to ensure that your group has the most successful educational program possible."