Because it happened suddenly and the sheer volume of people to get through the hall
Because people would just turn up anyway and start queuing up. And then they have to manage the people with tickets who were stuck in the queue,but missed their time slot.
Because it's going on over a few days.... And people will turn up on the wrong day.
Because who would be hosting this event online?
Because some people will book loads of tickets they don't want "just in case"
Having a ginormous queue will actually stop people going. Because they bcant orneont queue for upto 30hrs
It's enough to get the people through the security checks, let alone checking tickets etc.