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Accepted AnswerTodd FriedmanOffline
Accepted AnswerHenry BarnesOfflineFor TC collectibles specifically this would be it: http://www.ashow.com.au/ however you are an international (intergalactic?) treasure and I think larger pop culture events like Supernova (which generate a lot more press coverage; both industry and mainstream) would love to have you (http://www.supanova.com.au/).
These are roadshows (so go all over the place) but the main cities would be Sydney, Melbourne and Brisbane. I realise this reply is over a year late but I remember researching TG back in 2002 for a school arcade history project and my interest was piqued yet again when I watched the Nibbler documentary a few days ago (available through Netflix). I am sure a lot of down under Golden Age afficiandos would come out to see you at an expo, roadshow event.
The summer is great but with beaches generally closed in the cooler months winter is often good for gaming and indoor events. So the June-August period which generally coincides with the Sydney collectible's show and Supernova convention.