4:20 - 4.20.09

A youth blows bubbles onto the estimated 2,000 people who ... Thousands of University of Colorado students and others gather on ...

The annual 420 event was again celebrated by throngs of pot smoking young and old at Norlin quad on the University of Colorado campus in Boulder. -dailycamera

Although many diverse theories exist to explain the origin of the term, it is widely accepted that in 1971, a group of teenagers at San Rafael High School in San Rafael, California used to meet after school at 4:20 p.m. to smoke cannabis at the Louis Pasteur statue.[3][4] The term became part of their group's salute, "420 Louis!",[5] and became popularized in the late 1980s by fans of The Grateful Dead.[6] Many North American cannabis users continue to observe 4:20 as a time to smoke communally. By extension April 20 ("4/20" in U.S. dating shorthand) has evolved into a counterculture holiday, where people gather to celebrate and consume cannabis.[7][8][9] In wikipedia