i think its the Southern Districts Car Club that is your best bet to talk to
a mate of mine from army is a part of it (he gets involved in the Adelaide Hills Tarmac Rally), they do one day / weekend events 3 times a year i think he said
the 3 events and that all have to be specific to your licence (in this case the National Rally Licence)
Best bet, either ring CAMS or get in touch with a specific club
Im goin on what ive been told from a bloke who has been rallying (both dirt and tarmac) for about 10 years or more