Well ... us as drivers need to be there before 8am ... but the racing part to watch starts around 930.
So, you could get there around 930.
It will run until about 2-3pm ... they are much quicker than before.
So anytime between 930-2 would be fine to check out the racing.
My self, Zab and Izzy will run somewhere between 1030-12 depending on how fast the first wave of autoxers go.