If you're serious, check out the departments various lecture schedules. Find some interesting talks to go to & see if you can't introduce yourself to some interesting gals after the talk. If nothing else, you'll learn something in the process. Here's the faculty of medicine website. Each dept usually publishes their lecture schedule for the year online:
[url]http://www.medfac.usyd.edu.au/news/events/index.php#nov[/url]
If you do this next year, someone you know might even be there after September...