I was there at Baskerville on Saturday with 3 different cars. This is the best value type of practice, because its not actualy an event. You can practice at Baskerville almost any day if no one has hired it. It just so happens that I go to work during the week so Saturdays suit me better.
If you go to an event like this Street Shoot out at Symmons, you won't be able to do as many laps, and your time on the track won't be as flexible. When its private practice (no event organised) you can just do what ever you want, within reason.