Scott, you will find info for the Nats on the Cobra Car Club of NSW shortly, see link below.
In short it usually goes like this:
•Friday 30 Sept - track practice - casual day most cars have arrived.
•Saturday 1 Oct - Show and Shine, Timed Hill Climb, Drags, Slalom, and a sponsors Hot Lap in the afternoon.
•Sunday 2nd - Timed Supersprints ie, 6 cars on track together.
Each night a dinner and socialising at various establishments.
Cobra Car Club of NSW : Cobra Car Club of NSW