Thanks for all the restaurant ideas, people! We're sure to pick someplace good now!
Littlecritters, by late afternoon at the Sussex show, either the birds or the wind had taken down most of the signs - they're all there in the morning. (They have to be, or no one would know where to put their birds.) Either try and ask the breeder beforehand what they'll be wearing, or what other breeds of birds they will have. Other than that, you're just going to have to ask around until you find them.
Buyers - as with any show, there are rarely any sure answers regarding exactly what birds will be available, how much they will be, what quality they are, what age they are, and where the seller will be located. The only person who knows anything about the birds will be their breeder, and even they don't know their selling location until they arrive at the show. The show organizers only know that a space has been sold - not what's going to be sold in that space. The only way to be sure you go home with what you want is to make arrangements with the seller beforehand, and have them hold the birds for you. Other than that, you're going to have to take your chances with everyone else, but that's part of the thrill.
Happy hunting, and good luck!