There are four developers that I'm aware of here.
The one that made Ty the Tasmanian Tiger, Infogrames and Acclaim. There's also the one that handled the development of South Park Racing.
AS for the Aussie shows, I remember in a very distant issue of N64 Gamer (remember them?), they had a story that said Sydney was going to host a game show of it's own, but on a smaller scale than E3, but it was going to hvae Nintendo, Sony and other developers. It was going to be held at the Sydney Convention Center in Darling Harbour.
Other than that, there's no shows here. And if there was, what would Nintendo of Australia do?