King’s Birthday in Australia
King’s Birthday in Australia is held on June 10. Celebrated on the second Monday in June. Except Western Australia and Queensland. This event in the first decade of the month June is annual. 
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The first celebration of the Queen's Birthday in Australia was held in 1788. The Queen's Birthday is often observed and celebrated on the second Monday in June on the states and territories in Australia. However, Western Australia and Queensland is an exception.
Western Australia Day, formerly known as Foundation Day, is celebrated all over Western Australia on the first Monday of June every year to pay tribute to the founding of the Swan River Colony in 1829. The Governor of Western Australia each year proclaims the day on which the state will celebrate the Queen’s Birthday, along with the Perth Royal Show.
Queen Elizabeth II's birthday is on the 21st of April 1926. The Queen's April birthday is a private affair that she spends with her family. The occasion is marked with 21 gun salutes in Windsor Great Park, 62 gun salutes at the Tower of London and 41 gun salutes in Hyde Park.
Similar holidays and events, festivals and interesting facts
National Banana Bread Day in Canberra, Australia on June 7
National Vegemite Day in Australia on June 16
World Scleroderma Day on June 29
International Tartan Day on July 1 (Tartan Day is a celebration of Scottish heritage on 6 April, the date on which the Declaration of Arbroath was signed in 1320. It originated in Canada in the mid-1980s. It spread to other communities of the Scottish diaspora in the 1990s. In Australia the similar International Tartan Day is held on 1 July, the anniversary of the repeal of the 1747 Act of Proscription that banned the wearing of tartan. Tartan Days typically have parades of pipe bands, Highland dancing and other Scottish-themed events);
Constitution Day in Australia on July 9
Capybara Appreciation Day on July 10
International Weavers' Day on July 13