Now there are a couple of good ideas...
The place I used to fly in aus ran club competitions varying every month:
- Balloon bursting (hit it with the prop or it just bounces off)
- Flour bombing (self explanatory!)
- Streamer cutting (loo roll out the DV panel at 3000agl see how many times you can cut it before 1500agl
- Spot landings
Also they ran a 'young eagles' program to get youngsters interested in aviation - the patrons were the roulettes (Aus's red arrows), who would send someone down, often with an aircraft; the kids got goody bags, a bit of a talk, and a flight with a club member. Club members got reduced rates for those flights, and free landings - it was mostly done out of goodness of heart.
I guess nobody does anything like that over here? Too much litigation/paranoia?