Well, you're either going or you're not, but it's nice to see what you can do while you're there...
For a great many people, PAX Australia is an excuse to visit Melbourne and hang out with friends. Every time it happens, most of the highlights in my Twitter feed are of people hanging out with each other at a bar after hours.
That said, it's still worth paying attention to the show itself, and if you're intending to do just that (or um-ing and uh-ing over it) then you can hit up the official website to see what is happening on each day.
PAX Australia is taking place from October 27-29 at the Melbourne Convention and Exhibition Centre.