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4/20 Smoke Out at Colorado University-Boulder
This one's fairly self-explanatory. You have 13,000 people lighting up at 4:20pm on April 20 in the presence of bongo drums. Authorities have succeeded in shutting down students' pot party efforts the last two years, though, even covering the quad in a fish-based fertilizer in 2012 to deter the crowd, which is a shame because the commentary in the video above is enlightening (bonsai trees really are something else). With Colorado's recreational marijuana legalization coming into effect this year, this could be the spring the Great Smoke Out is resurrected.