Actually, not EVERY 4 years... There are exceptions to the rules.
While not an actual holiday, it is a special day...
You can visit these web pages to learn almost everything you would care to learn about February 29th.
Leap year From Wikipedia, the free encyclopedia
Why Leap Years Are Used
Leap Year / Leap Day
Honor Society of Leap Year Day Babies
February 29 Leap Year Day
Leap Year -- from Eric Weisstein's World of Astronomy
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