I am not sure.
There are a number of venues with different ticketing agents...Ticketek, Bass etc. There are also lots of larger events in the pipeline...The Big Day Out, the McLarnevale concerts etc and then you have a number of smaller venues like the Thebarton theatre that has hosted Paul Weller, Madness, B52's etc but I don't know who event manages or organises these (maybe someone else on here can help?).
In addition to this there are a number of smaller bands that play the pub / club circuits and these are listed in the Advertiser. My OH wants to see an Oz band called British India so we are waiting for them...there's a gig guide web site at http://www.yourgigs.com.au/
I'll look around and see if I can get any work in the events venues. I doubt that any pub will give a job but better try than not to.