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  The competition to design an opera house is launched.
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  At the close of competition, 233 entries had been lodged, from 28 countries. Source
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  Scheme Number 218 by Jørn Utzon is selected as the winning entry. Source
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  Architect Utzon makes his first trip to Sydney, Australia. Source
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  To this day, the Sydney Opera House Trust operates and maintains the site Source
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  Utzon is recognised as a Fellow of the Royal Australian Institute of Architects. Source
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  Utzon withdraws from the Sydney Opera House project. Source
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  A petition holding 3,000 signatures is presented to Premier Robert Askin, calling for the reinstatement of Utzon. Source
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  Peter Hall, DS Littlemore, Lionel Todd and EH Farmer are appointed as the Opera House's new architects. Source
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  The first public performance - Prokofiev's 'War and Peace' occurs at the Opera House by the Australian Opera. Source
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  The Opera House was formally opened by Elizabeth II. Source
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  The Mayor of Sydney, Councillor Frank Sartor, presents Utzon with the award. Source
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  The Opening Ceremony begins at the Sydney Opera House. Source
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  The Opera House is designated as a Heritage site. Source
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  The Opera House is listed on the National Heritage register. Source
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