I was just in Sydney last weekend to see Fidelio. The singer playing the title role was sick and the understudy was in Melbourne. They ended up calling a soprano who had recently played the role in Queensland. She had to drive to the opera house so it started around 40 minutes late. Ended up being quite an experience. Anke Hoeppner, the replacement, sang superbly especially given the circumstances. I often go to the opera here in Melbourne. Opera Australia, Victorian Opera, and the met recordings.