I do understand what you mean too, BUT I doubt there are many completely legal ae86's who would feel comfortable driving so far. I mean I really dont care, Ill drive to work or to adelaide, but for a p-plater or someone without another car it would be a huge risk.
The twilight events are usually alright. I havent been to one lately though. But if everyone would book and figure out their licenses and stuff it would be a pretty easy night. Or even we organise to have a meet in the carpark there instead of everyone having to book a spot.
What about All Japan day which is meant to be soonish?