Yeah, for one hour with school.
We just had house aths today, my school doesn't go... how was it?
I was only there for an hour, so I didn't go to any seminars; but I did walk around all the stands. They would be quite good if you had questions you want to ask; all the universities and colleges have representatives at their stand. Some had faculty specific representatives also. ANU had a lady for science. I'm not sure about commercey stuff; but Uni Melb had a very big stall and many people to speak with.
There were also lots of books and guides on sale, like checkpoints, A+, NEAP etc.
If you have a plan and want to talk to uni representatives or attend seminars, it should be good.
It got boring very quick for me because it only took 30 mins to walk through, and there wasn't anything else I could do.