If you go to a venue for a concert or to see sports or anything else, the venue is responsible for the staff, not the "guest" at the venue. If the venue doesn't have enough staff, they hire more. The "guest" pays for this service.
If the stadium in Busan is owned by the City of Busan, then the City of Busan is responsible for the things happening at the venue.
No one else.
when an artists books a venue they PAY THE VENUE and the same venue accommodates staff to handle the people bc its completely bonkers in any financial self for the artist itself to handle security and crowd control at the venue they’re performing i feel like im being gaslit