It says in the article that the thugs didn’t go to the school. This is a common problem with high school dances in urban areas, especially in gang areas. I have a family member who is a police officer (not in CA) who is often hired to work off-duty at dances just to keep these people away.
It’s odd that this school appears to have had so little security, given the nature of Richmond.
True. Still seriously, why would a 21 year old still go to a high school event like this? They will think they are a loser. I am surprised that homecoming is a big deal in a inner city high school, let alone a gang area.