You will probably only see wear in two areas: tires and brakes.
Tires: If you are running street tires, the wear shouldn't be too bad; you'll probably lose 2/32" of tread. It's really up to you, because if you're determined to burn up your tires on the track, you can certainly do it. Typical fast driving, however, will not use up your tires if you start with a decent amount of tread.
Brakes: You should make sure you have at least 5mm of brake pad left. Buttonwillow, Streets of Willow Springs, and Pahrump are tough tracks on brakes, so you'll definitely have some good wear for the day. If you question whether you have enough pad left, it would be wise to either change your pads, and bring the old ones as "spares", or buy a new set and bring them to the track. If you're new at the track, you probably won't use as much pad as I'm estimating here, but better to know you have enough pad than to get there and run out of brakes halfway through the event. Please note that if you do bring pads to the track, you should know how to change them.