There are so many variables at this point.
The arena/stadium owners will need to hold off booking any events until they get the all clear from the gov'ts. Then, they'll need to set a schedule for all the events that will be demanded, all the sports and entertainment, all the performers. They're be some huge demand and I'm sure, not everything has been cancelled yet. They'll need to cram everything in with little time to make everything work well.
All your A-list performers will want the prime touring schedules which will now overlap with other A-list performers. God forbid you're a B-list or C-list performer just trying to make a touring schedule work.
It's going to be a huge mess. And, the NHL and NBA will demand first access to the arenas.
Then, we'll have overlap with other leagues and whatnot.