Portal:Australia/Anniversaries/October/October 20
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- 1973 – The Sydney Opera House is opened by Queen Elizabeth II.
- 1987 – The Black Monday stockmarket crash causing the All Ordinaries Index to fall 25%, the single biggest one day drop in the market's history.
- 1989 – The Grafton bus crash occurs, with 21 people killed and 22 injured when a tourist bus collides with a semi-trailer on the Pacific Highway near Grafton.