Hi Mark, I'll be there with our 540i, I hope to see you.
We usually get about 50-60 cars at any one time, sometimes more, and overall the weekend all the events will total out to about 500-600 people (total of all events).
The Motorsport day would be of interest to you on the Monday at Wakefield Park at Goulburn, not far from Canberra, when all the rev-heads congregate. Cars range from 2002's to E46's. On the track mainly E30, E36 and E46 - always a number of M3's.