Large sporting events where the fans are jammed in like sardines are extremely vulnerable.
No matter what the trigger event, if a panic breaks out, 100s or 1000s could die jammed in exits and pushed from upper decks.
I took the hubby to a game on March 4th. It was a spook time during the Spring Break War, and I was not entirely comfortable. Our seats were way up there and it was a long way back to our home in the country.
(It was a great game - Maverics beat the Nets. I think this is a preview of the NBA finals.)