Hey Danielle (and Diego),
I've been autocrossing my Vette for many years now. There's a couple of schools of thought on the topic...but generally most folks start with the fronts in the 32-34 lb. range and start with the backs like 2 lbs. lower. Then they'll typically adjust to fix car handling problems (i.e. understeer/oversteer, mushy turn in, etc.). But that being said, I know fast guys that run higher, and fast guys that run lower.....differences being the specific tires, sidewall stiffness, feel of the car, etc.
I'd be happy to help you two get your car sorted (or introduce you to one of our car setup gurus and you can dive down that rabbit hole!). I'll have an inflator and air pressure gauge that I'm more than happy to share if you want to just drive to the event at factory 30/30.
That being said, if it's your first event, I wouldn't get too hung up on tire pressures and car setup right away. Your first event you really need to just focus on autocross driving basics. I'd be more than happy to help you get started, and I can also introduce you to all the other Vette drivers we have out there (I see at least one other signed up for Saturday). We have quite a few that run with us regularly.
I'll be in a red C6 Grand Sport. Feel free to paddock somewhere close and introduce yourselves. I can help get you setup with some instruction to get you started on the right foot, and of course I'm always happy to share my right seat on my runs if you'd like to ride along. Make sure you come early and walk the course (or introduce yourselves early and I can hook you up with somebody that can give you some pointers on your course walk as well).
Your car runs in A Street for competition days, but as George said, Saturday is a practice so no numbers and classing aren't necessary. Just arrive nice and early, head to the registration desk, empty your car and take it to the tech line, walk course and make sure you attend the driver's meeting and course working training (for 1st timers right after the driver's meeting). We're a friendly bunch, introduce yourselves and let us know it's your first time and you'll have plenty of friendly people pointing you in the right direction!
If you have any other questions, feel free to ask.
Welcome and we'll see you out there!
Event Master for the weekend.