PAX Aus takes place at the Melbourne Convention & Exhibition Centre, which is conveniently located in Melbourne, Victoria. The address is:
Melbourne Convention & Exhibition Centre
1 Convention Centre Place
South Wharf 3006
If you're flying in, the airport you want is the Melbourne International Airport with the airport code of MEL. The MCEC is located near the Melbourne CBD, 15 minutes from Melbourne Airport and easily accessible by public transport, rideshare or car. For up to date public transport info, visit the MCEC website.