Download the conference registration form here.
The Harbourview Hotel in North Sydney, (http://viewhotels.com.au/northsydneyharbourviewhotel), is where the conference will be held. Their rates for the Thursday are quite high ($325) as they are a corporate hotel. There is a group rate for Friday night accomodation at $195.
If you want to book at the Harbourview you can book by ringing 02 9455 7432 and asking for reservations. Quote the group code: 178030.
There is also a more affordable hotel which is about 5-6 minutes walk away. I think it is $180 per night. The details of that are The McLaren Hotel (http://mclarenhotel.com.au)