The second time I went to the opera house was for the dance theatre “Bennelong”.
It’s about the life of an Aborigine called Bennelong who lived with the Eora tribe. At that time they conscientiously avoided contact with british newcomers. Bennelong was kidnapped and brought to the settlement at Sydney Cove in November 1789 to establish relationships with the indigenous populations. He managed to learn english and did much more awesome stuff which you can check out at Wikipedia.
In 1790, the governor built him a hut on what became known as Bennelong Point (now occupied by the Sydney Opera House).