Young Eagles
EAA Chapter 91 hosts smaller rallies monthly here at Lees Summit, MO (KC area) from Apr-Oct. Typical turnout is 50-80 kids flown between 0830-1200am.
In Aug the KC Downtown Airport hosts a large rally with approx 350 kids flown between 0830am and 3:30pm as part of a Youth Aviation day.
Time available with the Young Eagles is driven by crowd size and available planes as well as the mix of aircraft. The smaller rallies offer a more personal experience in my opinion, with individual flights being even better.
Time permitting, the best experience includes letting the Young Eagles participate in a walk-around of the aircraft and discussion of control surfaces, etc.
Once in the air, let them fly to the extend of your/their comfort level.
Make sure the ground crew understands your plane's limitations in terms of passenger size/weight, etc.! We've had some huge (tall, overweight, etc.) kids show up at our rallies. It's much better all around if they are placed with a C182, etc. than if they show up at your RV and you have to say no...
Note that policies may dictate which kids are able to ride in your RV. As an example, the Boy Scouts' policy states "Flying in hang gliders, ultralights, experimental class aircraft, and hot-air balloons (whether or not they are tethered); parachuting, and flying in aircraft as part of a search and rescue mission are unauthorized activities."
Be prepared with barf bags (every seat in every plane), water, spare headsets, etc.
The ground team should also try to arrange other activities to keep the Young Eagles occupied while waiting their turn; suggestions include:flight simulators, static displays, sheet metal workshop, model airplane workshop, aviation movies, etc.
We also have a team handling registration/double checking permission paperwork, cranking out flight certificates, etc. so that every Young Eagle departs with flight certificate and logbook in hand. Last year Sporty's included a gift certificate valid for free online ground school training that was very popular.
Good luck,
Mike