There was a mini Expo organized by a Pinball Enthusiast from South Australia around 7 years ago ? It was tiny compared to the Sydney Expo, but it was not a hugely promoted event.

I think an event like an Expo needs to be run by Collectors/Enthusiasts/Hobbyists - Similar to what the Sydney Expo Organizers are doing. From the success of the Sydney Expo, the Organizers will have a track record to build on a similar event.

These guys are doing something about the Expo, not talking about it. There's a bit of a pattern there 

A Melbourne event should have continued from the first Expo in Melbourne, but no one chose to organize a follow up. It would be great to have a traveling Expo - and Melbourne is the Aussie home of Pinball !