The show with the wheelstanding VW was the Lexington Motor Show, which was for the time a pretty big deal, using all the display halls at the Epsom Showgrounds. It was May 1969 and I think my hangover had gone by June!
The VW was bought over by George Stewart from Melbourne, it actually performed well considering a few mechanical issues and driving on the boards in the fairly constant drizzle.

And just on a timeline regarding stockcars, Waikaraka Park would have just completed its second season of racing, its coming up to season 44 at the end of this year!