Anniversary

Date of an event from a previous year and the observance of this milestone / From Wikipedia, the free encyclopedia

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An anniversary is the date on which an event took place or an institution was founded in a previous year, and may also refer to the commemoration or celebration of that event. The word was first used for Catholic feasts to commemorate saints.

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Swedish celebrities including Miss Sweden Johanna Lind, Camilla Henemark, Alexandra Charles and Christina Schollin celebrate the 100th anniversary of the birth of Mae West at Berns in Stockholm in 1993
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Memorial plaque presented by the National Capital Sesquicentennial Commission in Washington, D.C. in 1951

Most countries celebrate national anniversaries, typically called national days. These could be the date of independence of the nation or the adoption of a new constitution or form of government. There is no definite method for determining the date of establishment of an institution, and it is generally decided within the institution by convention. The important dates in a sitting monarch's reign may also be commemorated, an event often referred to as a "jubilee".