My advice if you want to talk to domains in Sydney,
And also SEO, E-commerce, Social, Start ups, Development the best thing to attend at the moment is probably the monthly - SEO/Social Meet up in King Street Whalf.
It started with around 5 people now you have around 35 people turn up. It is a good event.
Ive been to a whole bunch of meet ups in Sydney if it is developnment, Wordpress, Affiliates and this one is the best apart from going to a conference.