ZeroR,
CMP is a large and demanding track. Make sure you do a thourough bolt check on the car, flush/check fluids, check cooling, brakes, bleed brakes before. Check tire pressures and don't forget to rotate them during the day.
Bring if you can some basic tools, torque wrench, oil cans, brake fluid, cooling fluid (premixed will get you out of trouble), jerrycans for gas, sun screen, water, snacks. An oil filter, tie wraps, duct tape. The last thing you want is to end your day because of a .050¢ piece. And you have to come home also.
Just my suggestions. You are better off coming home saying you didn't need all that crap, than.... well you get the idea.
Enjoy.