Is it illegal to be at a street racing car meet?

Weekly, cars after cars meet up at a pretty big parking lot with some food places such as dunkin donuts and burger king. Street races are organized there and they are performed on streets close to the parking lot but not next to it. The cops normally come to shut it down but no busts are done. If the cops did a bust and got everyone trapped, how could they prove that people were spectating or racing? Could they give tickets anyway or no?




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