happens each year in South Florida on Martin Luther King Jr. Day: motorcyclists and ATV riders hit the streets for their annual "Wheels Up, Guns Down" protest.Law enforcement agencies in Miami-Dade and Broward counties brace for the event each year, where riders perform wheelies and weave between cars, ignoring traffic laws.The unofficial event has grown over the years, encouraging riders to take their ATVs, dirt bikes and other vehicles that are not street-legal on busy roads as a protest against gun violence."They can’t stop us," one rider said to WSVN during last year's event.