Few political movements have been more successful yet under-the-radar than Critical Mass, an unofficial bike ride held in cities nationwide on the last Friday of every month. The point is to remind motorists that bicycles are vehicles entitled to use city streets, so please stop running them over. Dallas' Critical Mass is also just a fun way to meet people, attracting a friendly crowd that's happy to spend a few hours exploring together without knowing the destination point. The turnout tends to be stronger in the warmer months, with July's event getting a crowd that appeared to be at least 400-strong. All cyclists (or occasionally, someone dressed in in-line skates or just jogging clothes) are invited to join the fun at Main Street Garden for a 7:30 p.m. meet-up and 8 p.m. departure. The ride is slow enough to welcome riders of all skill levels and ends at a different bar each time.