"March 14 marks Pi Day, an annual celebration of the mathematical sign pi. Founded in 1988 by physicist Larry Shaw, March 14 was selected because the numerical date (3.14) represents the first three digits of pi, and it also happens to be Albert Einstein’s birthday.
The first Pi Day celebration took place at the Exploratorium (Shaw’s place of work), a San Francisco-based interactive science museum, and featured a circular parade and the eating of fruit pies. It wasn’t until 2009, however, that it became an official national holiday when the U.S. House of Representatives passed legislation."
Source: https://www.history.com/news/where-did-pi-day-come-from
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