[EricH]

4 extra-large regionals in one venue. Stand clear of the doors when they open, because you'll have tens of thousands of people heading for their pits/the fields simultaneously.

Oh, and throw in FLL and FTC teams for good measure.

When Championships were in Houston, there were two sets of ramps into the pit area. A volunteer reported that he got to the middle of the pits and then the door opened at one set. There was an immediate river of people.