Driver's License: A valid driver's license is required for all entrants. Be sure to have it in your possession when you register.
Magnetic numbers or tape ( BLUE Painters) for creating numbers
Tire pressure gauge
Clothing appropriate for the weather
Helmet: If you don't own a helmet, loaners are generally available. Helmets must be at least M rated, but consider a Snell rated helmet for future Driver Education track day use.
Food and Drink - there's no lunch break to go and get something. We will have a cooler of water for the event.
Sunglasses.
Sunblock and hat
Trash bag/tarp to store your car's rattley bits while you compete.
These items are nice to have:
Driving gloves. You'll drive better because you won't be concerned with grip
White liquid shoe polish for marking tires or numbering
Air tank or Tire Pump (especially if bringing a tire gauge to lower pressures)
Spray bottle (put water in it; great for cooling off tires)