I think they should skip the bounce obstacle course and instead pull the bleachers out to give the parents somewhere to sit in the gym. Then they could rope off a part for dancing (sort of like a vip area). And put all the activities on the first floor. And do anything you can to make the lines less for whatever you have (face painting, ballon artists). Instead of face painting, maybe glitter tattoos that only take 30-60 mins a kid or “tattoos” that could be applied quicker