Trade seminars
A good question but a tough one for me to answer. Apart from the major careers expos and local expos it would be individual institutions (unis, tafes, colleges) that offer info sessions. If you are interested in a particular industry then try contacting their state association to see if anything is being run.
You can always contact a Group Training Organisation - national directory available at
www.grouptraining.com.au They can advise on what might be around.