From CASA’s Air Display Manual:
“Organised flying, including cross-country events, contests, exhibitions of flying or local flights made for the purpose of carrying passengers for hire or reward performed at a public gathering.
.......
• Fly-in, Competition or Cross country event:
A gathering of aircraft at an event or competition not on the basis of a general public invitation (A club event where no invitation is made to the general public [[similar clubs or groups exempted]) does not need to apply for an air display approval from CASA.”