Carl; It's in one of the parking lots at the Woodlands. Just go there and you won't be able to miss it.
Show up at about 9-9:15am to get your choice of run/work times.(see the topic of the autocross to get a better idea about that; I won't retype that here).
Things to do to before you go:
1) Pump frt tires to 50-55psi (Gen2).
2) take all loose stuff out.
3) Bring a HELMET. (if not, they have free loaners).
4) Bring a lawn chair and Cooler.
reread my other post on the autocross and that should give you a good start...
GOOD LUCK!