Happy Pi (π) day
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Every year on March 14 — Albert Einstein’s birthday — math lovers can raise a piece of pie to Pi (π) Day, an international celebration of one of math’s most famous constants: the irrational, never-ending number π.
The event was founded in 1988 by Larry Shaw, at the Exploratorium in San Fransisco. Celebrations often involve eating pie or holding pi recitation competitions etc...
https://en.wikipedia.org/wiki/Pi_Day
https://www.sciencealert.com/its-pi-day-heres-why-this-special-number-gets-a-global-celebration