Relax and have fun. Most of the really fast guys will be at the Atlanta Region SCCA Event tomorrow. It is in Downtown Atlanta at Turner Field.
Clemson Sports Car Club is a college club. They loosely follow the SCCA rules. Watch for curbs. Some of their sites might be a little hazardous. Run the event and have fun but be careful.
Walk the course as many times as you can. You want to have the course memorized so you know where you are going. You can concentrate on how you are going to get around the turns if you don't have to think about where you need to go.
Look ahead!!! Be looking at what you need to do next rather than what you are doing now.
Raise the air pressure in your tires. You will probably want to start out around 45 PSI. Look at how far you are rolling over on the sidewall and adjust the air until you are off of the sidewall - edge of the tread is OK, but stay off the sidewall.
AT Tech inspection, they will probably check for missing lug nuts, loose items in the car, Battery tied down, throttle return spring, play in steering, solid brake pedal,etc.
Hope you have a helmet. Those skunk helmets(loaners) get kind of ripe around here in July and August.
Remember, get there early, walk the course, look ahead, and have fun.