In true counterculture fashion, there are no organizers for the annual 4/20 Celebration at Hippie Hill in Golden Gate Park. An entertainment company will not be setting up a fence, booking bands, or ordering Porta Potties. There is no mention of it on the San Francisco Recreation and Park Department website, and no need to RSVP. The best description we could find of the event came from the marijuana blog tokeofthetown.com; it sounds about like you would expect: drum circles, dreadlocked youngsters, "special" brownies, and a huge collective "smoke out" at 4:20 p.m. in celebration of the marijuana holiday. Most of that is considered good, clean fun by San Francisco standards. But there is one problem: trash. Last year the Park Department hauled away 10,000 pounds of very official garbage from the unofficial event. So please, come to the park, have a good time, and soak in a bit of our countercultural legacy. But don't leave your mess lying on the ground.