Not sure who holds the account password - it might be @nedwin. I actually work at the Melbourne-based YC startup Adioso.com. The cofounders Tom and Fenn led the last one a bit.
These threads are worth viewing for info on previous meetups:
February 2010 – http://news.ycombinator.com/item?id=1091571
October 2009 – http://news.ycombinator.com/item?id=849668