Pot Day
4/20, also known as Pot Day, is a nationally- and internationally-observed subculture holiday celebrating the consumption of marijuana.
In 2010, the University honored the holiday by providing a free screening of Neil Gaiman's horror/fantasy film Coraline on the Low steps. The screening came complete with 3-D glasses[1].
Bwog celebrates the day by posting an insane home video made by stoner Columbia students in 1980[2].