The World Cup is in North America in 2026. It is possible that this was what he was referring to. They've got to have these scheduled years in advance so the plans may not have been solid when the venues were selected. That is just a guess. They've had, and continue to have, big concerts there so I am not sure if that qualifies as "big, big, big". I can't think of another event that would qualify. Its a good question.
I sat next to a guy on a flight from LAX to Hawaii several years ago. He told me he was going to Hawaii to plan an ice skating event in Honolulu. Surprised, I asked more. Turns out he was an advance man for these ice events at various venues. This was right when they started to do outdoor NHL events. He told me that they had the Penguins and Flyers all set up but the Pens didn't want to play in Philly and Philly didn't want to play in Pittsburgh. So they looked at State College but the cost to winterize the Beav was way too much and the deal fell apart.