The biggest issue with basketball and hockey is the amount of time it takes for UNION workers to tear down/prep the arena for each sport. One has special wooden floor and the other an iced surface and perimeter boards. That craps takes time (like YS between soccer and baseball games)
With soccer/concerts, they'd throw down tarps in areas to protect the grass and build a stage. That's pretty easy, especially if there's a way to wheel the base of the stage in like with super bowl entertainment.
Bingo