If you're interested in a tech evening with a couple of good speakers, you might want to check out the JAOO user group night on March 17. It is $15 to attend, and located in Darling Harbour, from 5-8pm. The main page for the evening doesn't seem to have info on the talks but a printed flyer had a bit more information. The talks are:
UPDATE: The JAOO site now has information about the talks. We've also been offered a $5 discount if we have 5+ people coming to the event, so feel free to comment if you plan to come (we'll be given a discount code to use when signing up).
UPDATE 2: Free tickets available for tomorrow night! Contact me for the code.