Stadiums and arenas are multi-purpose buildings and host more than sports events. Stadiums try to maximize their revenue by scheduling events when the team is playing elsewhere or has off.
This can be tricky come playoff time because you can’t tell whether or not your team will play at that time. On one hand, you lose out on thousands in revenue by having to keep your dates open and on the other, if you fill those dates with something else, you risk an embarrassing situation of valuing something above the team who regularly plays there.
This is where we get to Ed Sheeran.