At Asia Pop Fest in Melbourne there was a concert where IA performed as a guest. It wasn't a proper hologram concert but it was a test to see if people wanted more. So yes there has been a sort of concert (It was very cool, I was so lucky to be able to go!) and if we're lucky we may even get proper ones in the future! :+)
There's an opera with Miku coming to Adelaide in October look here: https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=1&cad=rja&uact=8&ved=0ahUKEwjP7-OH7sHVAhVBjZQKHTeRBJoQFggoMAA&url=http%3A%2F%2Fwww.ozasiafestival.com.au%2Fevents%2Fthe-end%2F&usg=AFQjCNGSrm19s5grlBIOhnNDJy6wKn4_2w
There's also this website: https://www.google.com.au/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&uact=8&ved=0ahUKEwjP7-OH7sHVAhVBjZQKHTeRBJoQFggyMAE&url=http%3A%2F%2Findaily.com.au%2Farts-and-culture%2Ffestivals%2F2017%2F07%2F25%2Fworlds-first-virtual-opera-coming-to-adelaide%2F&usg=AFQjCNGqxn8Wrhv_jatd3ncVSZZsp20Gaw
I hope i was able to help in any way! :)
I agree, I want them in Sydney. For the rest of my younger days, I'll probably never go to Japan or any other countries holding events, and by the time I'm an adult, Vocaloids may not be a thing anymore.