While trying to find a definitive list of tech conferences (and meetups) in Australia (mainly Sydney) nothing significant could be found. This is an attempt to list most of the tech conferences and meetups happening in Australia.
Australia has a good number of tech conferences, find out about your next tech conf here.
Tech meetup scene is very vibrant in Sydney and Melbourne, probably in other cities too. Check this list to know about the next meetup you should go to.