The metro expo was just at the Huntington Hilton last Monday. It didn't seem as good as the great bridal expo I attended a while ago at the same site.
From what I remember, the guy said they have 2 camera men shoot the entire day, getting different angles and they arrive 3 hours before the ceremony even starts, so they get all the action (one goes to his place, the other to the ladies prior to the ceremony)!
One of the options, was to go in 2 weeks after the wedding, and sit with them as they ask the newlyweds questions about the day, such as how you felt at certain points, what you might have been thinking. Then they incorporate that into various parts of the day's events.