At outdoor concerts, large gatherings and events, crowd control barriers are very important. These will serve as protection for gatecrashers or audience that will turn unruly and when crowds become angry mobs. These barriers also keep the distance of the spectators from the performers on stage. But sometimes performers, especially those famous singers and bands, would still take the opportunity to get near their fans by going to the crowd on the grounds.
Events like these too sometimes stir up brawls, but thanks to crowd control personnel, these occasions become safe for viewers and performers too and people would always look forward to other gatherings and concerts.