I am working in Canberra (from the UK) during a few weekends in July, and am looking for games. However, no luck yet in joining the Armada Australia or Canberra FB groups...
I see there is a blog post from @Captain Weather regarding store champs: https://intelsweep.wordpress.com/2018/06/07/list-of-australian-store-championships-2018/
The Games Cube in Parramatta has a tournament on 13 July which could work. Not clear if this is the store champ though.
Will be trawling through the list of stores on the post to find dates, but if anyone has any intel, let us know!