4:20 Day at the University of Colorado
Mark Leffingwell, photographic print, 2008
'4:20' day is celebrated across the USA as a counterculture
holiday, and a focus for the campaign to legalise cannabis. It is
observed on 20 April each year, and has become particularly
prominent at the University of Colorado, where in 2008 over 10 000
people gathered for a mass 'smoke-in'.