Instead of holding the meeting in a community center, maybe make it in someone's house, with hosting cycling thru the families and being a quasi responsibility/honor?  The house could have a pool, and the kids who don't want to hang around the adults could hold their own party the next pool over.<br/><br/>Don't know how feasible that is for what you have planned, but seems like it might be a thing in a neighborhood where people want to see and be seen.