April 20th is a day when typically pot smokers and anyone who wishes to indulge in the recreational use of marijuanna. This is known to be a celebratory day for teens especially but not limited to. Usually freinds and anyone who needs chronic get together and smoke as much as they can find. Try rolling blunts, l-joints, bongs and poppers. The graffitti for "420" can be found on walls everywhere aswell.