This is nothing new. I seen it!
Where I used to live, about 3 years ago, I was sitting at the park with a friend. About 30 people showed up in the parking lot. I told her there was going to be a fight. She didn't believe me until about 30 minutes later; a guy pulled up in his car. He got out with two other people, and he got whooped.
The park was a common place for fights because you can't fight at the local high school. I was once challenged into a fight just for being there. Though looking back, I think he was a bit retarded, and I mean literally he was retarded.