I,m sorry Jim,I have to side with Andy on this one.
As I see it the dealers are the same as retailers only without a fixed location.
You wouln,t want to rush to your local store knowing they are open until 10
only to find out that they felt it was slow so they closed at 9:30.
As far as time constaints, when they signed up for their table they knew what hours the show would be open. They than should have made their plans based on the commitment they had made.

Best Regards
Ralph