Seattle Hempfest isn’t just our local gathering – it’s the world’s largest annual cannabis “protestival.” The granddaddy of all pot parties celebrates its 20th anniversary this year, and it looks to be bigger and better than ever, adding for the first time a third day of festivities. Featured are dozens of speakers and bands on the venue’s multiple stages, along with educational seminars, lots of fascinating vendor booths, and absolutely unparalleled opportunities for people-watching. With Hempfest’s gentle, mellow vibe, it’s the most relaxed I’ve ever felt in the company of a few hundred thousand people. STEVE ELLIOTT August 19-21, Myrtle Edwards Park, hempfest.org