For computing history appreciation (both software and hardware) try https://www.acms.org.au/

For the Makerspace end of this, try Robots and Dinosaurs: https://robodino.org/ They have open days every Saturday.

For the electronics end, try HAM radio. The state club is https://arnsw.org.au/ and a locally based national society is https://www.wia.org.au/ but there are many local clubs in different groups which typically meet weekly on-air and monthly in person spread around the city.

The closest thing nowadays is uni societies