Not complete conjecture, I know how to run an event properly, it takes months to plan.
You have to get the venue, you have to sell tickets, you have to get an agenda, you have to get entertainment (In this case speakers) you have to prepare the venue.
A successful event requires proper planning.
You try to run an event for 80,000 people, its not easy. especially with high ticket prices you need them to come home satisfied and want to come again.