How do you deal with the "last-day" problem?

That's what David Shaw over at B or not 2B wants to know:

Many trade shows have to deal with the problem of the "last day." The

problem: how do you keep the exhibit floor from becoming a ghost town

in the final hours as people hit the airport to get home?

He wonders if putting the best content last can help. It sure doesn't hurt, but in my experience, it still doesn't totally solve the exodus problem. Do you have any advice to share with him? If so, drop it in the comments here or click here to comment on B or Not 2B.