Zennon wont be going saturday but you should have fun.
Make sure you pre-enter as entering on the day is a thing of the past.
Last time I went (27-Aug) was on a Wednesday.
Wednesday's are heaps better because there are less cars and you get to do the clubman and the sprint track.
Anyway there was 4 skylines (including me), 6 porches, 3 rotaries, 4 new minis, and a few others.
Cant even remember what time it is on saturdays.. think briefly is around 12 or something or maybe
Use to have to get there early so get a pit spot but these days they allocate pit spots based on when you enter
(hence fax your entry form in early!)
Remember to wear natural material long pants and long shirt (not plastic thats melt to your body)
In the old days it was three sessions which each had 1 warm up lap, 5 hot laps, 1 cool down lap,
and then if they had enough time (didn't pull people out of the kitty litter etc) you get a 4th go..
These days I think it is very rare to get a 4th session in due to amount of people...
Anyway enjoy!
edit links:
website
sprints quick guide
entry form