All of what has been said here is very valid. Just make sure you do a thorough check of your car. The link below is a start. it is the SVTOA tech inspection form for their Ontrack events.
Bring along a plastic tote / bin and put some bottles of fluid that you might need (brake fluid, ATF, coolant, oil... etc). Also bring an extra set of brake pads... just in case.
http://svtoa.com/events/tech%20inspection%20form.pdfOtherwise have fun and if it is available make sure you have an instructor with you in the car. It makes for a great learning experience and increases the comfort level.
Cheers
Fern