There is a web site i often look up call Pinkies ...    www.pinky.com.au 

On there you'll find the odd bike rally or bike ride, but advertises Car and bike shows , swap meets , all sorts of stuff.. You can look up just Victoria  or Australia wide .. Not sure if they email out a list or just look up the website , It also shows events month by month..  

Hope that helps  , 

Judi