If other meetup organisers are anything like us, now is probably a little too soon to be advertising and planning an event. As it gets closer to the date, I'm sure plenty of events will start appearing on meetup.com. For now, there are a couple listed, although I'm not sure if the dates suit you:
* IxDA Sydney
* [Product Mavens](http://www.meetup.com/Product-Mavens/events/185029072/)
Definitely search for "UX" and "design" on Meetup once you arrive, and you should find something.
And let us know if you manage some time to head down to Melbourne. We'd love to catch up!