Bird shows are sort of like a dog, livestock show. They are usually put on by a group of breeders breeding show quality stock. For instance the Cockatiel Society of America. They divide birds into different classes, Normals.Lutinos, Pied, Etc. They have lots of rules and a panel of Judges for different divisions. It's more like a country fair where everyone wants to win the Blue Ribbon or "Best in Show" award. The birds are put into individual ,identical cages ,given a number and judged on many different things. With bird shows there are lots of birds,cages,feed,toys,etc for sale.Usually they kid exhibits for kids to see pet birds on display along with their handlers. They talk about the different birds and their care and feeding,etc. Basically something to help draw the whole family into the outing.Bird Fairs are more about products /goods and not about judging the bloodlines of birds. Either of these events is NOT the place to bring your pet bird, usually all birds involved in these type of things are inspected by a vet before being allowed into the building, and chances for spread of disease are very possible. I would not handle birds there, and would change clothes,wash,shower,clean shoes, etc. before going home to handle my pet.