Its solo II, I believe run by the corvette compitiion club but is open to all cars and I think is every other week.. I went quite a few times when I first got my car.. Lots of fun as you race against time, one car at a time. You can just show up in the morning, pay there and sign the waiver.
You should get there early in the morning though, where you walk the track to read the line you will want to take, you will also take turns marshalling the course (basically picking up knocked over pylons). Depending on the amount of cars that show you will most likely get 3-6 runs . If you have a helmet bring it, otherwise they sometimes have an extra you can borrow.
If you havent done this, you gotta try it at least once. Oh ya, and leave your ego at the door.. there are some good drivers in VW's or miatas that will kick your butt

If you take the 1st or second run smooth you can learn alot about how your car handles and then step it up a bit.. Solo II can be pretty violent on the car...lots of 1st gear 2nd gear pounding and heavy braking...
If you go...enjoy it, but like everything good, it can become addicting.