Howdy
There's a Sydney Blues Club you should definitely hook up with. They have weekly jam sessions and gigs on a couple of night per week at a pub in Annandale (inner Sydney suburb). Even though I drive past it a few times a week, I can't think of the name!
There are also Blues performers on at the Basement in Circular Quay from time to time (I'm sure they have a website).
I'm not in the Blues Loop, so can't help with any personal connections!
Drop me a message if you want me to chase up more info for you.
happy travelling Callie