Sanctioned and Non-Sanctioned Events can be found on the website nominate.com.au
When on their website, just select the events tab on the top right side.
You can see the classes and nominate for the ones you would like to compete in.
You pay for your nominations online at the time of nominating.
A current snapshot of the nominate.com.au page can be seen below (mobile devices may take a minute or so to load)