The Showground Supercross was promoted as the “first Supercross”. (Could have been “first Sydney”, “first city”, “first Showground”)
A few of us drove down from Newcastle to race.
One of my friends was amazing us all, including Steve Gall, by jumping through the woops on his YZ125H. Later that night he got a false neutral over a big jump, landed on his back and cracked some vertebra. This was the start of a theme; of visiting capital city hospitals late on Saturday nights.
That track had the “corkscrew” obstacle (once one rider crashed, no one could get passed - disaster) and the semi trailer backs up into the stands, then a jump back down onto the track.