for Dave - the Amp Hour in-reply to "where is an electronics club-or show in Sydney?"
in my opinion the best way to start an electronics club-or show is to piggyback on the back of an existing show or event!
example an
Amateur Radio hamfest in the Sydney metropolitan area.
radio amateurs will buy swap sell almost anything electronics at a hamfest!
so set up a sellers table, and flog off some of your ex-mailbag electronics now cluttering the lab. = cash in the hand!
radio amateurs will buy anything electronics not just used radios. vintage computers, video games ,test equipment.
then You try to get on the program as a guest speaker speaking about.? say vintage computers or electric vehicles or test equipment or starting your own
electronics lab. in time as the word gets out more and more will show up for you. growing the event.
the event management will be happy with this. free promotion for you too.
try this link for Amateur Radio hamfest's
https://www.wia.org.au/members/broadcast/wianews/