Having been a dealer in other items I feel with the Dealers.

If the collector thinks he was cheated let him ask for a refund on admission price.
For the public, stop charging admissions at noon on Saturday.

Dealers coming from as far away as they do, have time constraints. Advertise the show 10 till ? on Saturday. I Think 18 - 20 hours of show time is plenty.

and that's my 2 bits worth