It all depends on how much time and help we have to get things set up.
Things I think we could do for sure
track: A good size track with some small jumps (rollers), obstacles, flags etc set up in the center of camp
wheelie contest: that's easy. All we need is 2 cones or a start mark and someone to mark where the wheelie ends.
1/16 mile drags : same as the wheelie contest place but mark a finish line Then just have a stop watch for the e.t.'s
endurance race: run to comp or wherever we think is a challenging yet "reasonable" place to try and make it to on a 70
All the other things you mentioned seem cool. We'll just have to see how much time we have. No need to try and cram a bunch of chit into one day. Let's just have fun with it and play it by ear.
Careful what you wish for.