Some type of night activity for around the campfire to encourage socializing. Whether it just be DJ:d music or a large bonfire with someone's car for tunes I;d like to see something to get us all together in the evenings.
An open RTI ramp would be nice. I have seen some very neat technical courses setup that were not abusive to the vehicle, such as ; Log Teeter Totter to test/show balance, A row of staggered logs to show/test articulation, a steep bank to ditch to cross, stumps or logs sticking up to place a tire on etc. More technical and novel than a part breaking festival. A short steep hill with a flat spot on top to show driver control. I will see if I can find a good link to one of these events, they are pretty cool to watch.
For the more laid back type, I would like to see a nice scenic trail ride. Something with decent scenery, gentle hills, and tight turns. Enough to keep the average person from getting bored, but easy enough the wife and kids want to come, or even drive themselves. I am usually into the more technical trails but something like this would attract the kick back crowd that doesn't want to break their rigs.