There is an offroad park here in College Station, Tx w/ about 1500 acres. They are holding an even September 9-12 that will be including mud truck races, mud bogs, $500 cash prize for truck events (the truck races and mud bogs are on that saturday), atv trails, a live band, and a wet tshirt contest.
I will definitely be going and I will be getting in touch with our local diesel club to see if they want to get a group together. Let me know if you want to go! Its going to be awesome. I want to try and get a big group going.