The Manhattan Critical Mass starts at Union Square North, Washington Square Park, Tompkins Square Park, Madison Square Park (and several other locations, apparently). Critical Mass is a spontaneous celebration of what our streets could look like. This fun group ride encourages new cyclists and creates safer streets and new green infrastructure. Strap some music to your bike and make sure to bring the appropriate lights and bells. Come along for the ride! This recurring event takes place on the last Friday of the month.