I'm a (not very active) member of the Astronomical Society of Victoria. It is quite a large club with lots of special interest groups and acts as custodian of the instruments of the Old Melbourne Observatory in the middle of town. They have observing nights for members there and also operate a large scope in club premises in the Eastern surburbs. Membership also entitles you to assess their dark site in central Victoria. etc etc
Check them out at
www.asv.org.au