I attend this fair when it is in PA, not Ohio, so I only know PA. The venue is small but there is ample space for MORE vendors. The variety of breeders varies but there are a few regulars (a couple rescues, a few breeders, a zoo), and there are a couple toy vendors, though in my experience, the toy vendors gear toward larger birds, not smaller, and I would love to see more, as a customer. If you make treats/food/chop/etc. it is also needed!
It can be rowdy, families are drawn to the show and the children do not always have the best manors, so I'm sure it could get overwhelming for the birds. As a customer, it's the closest bird-specific place I can go for toys, etc. and I can easily spend a small fortune there. I don't know how well breeders do, but I did buy my latest bird from a breeder there, so if nothing else, it'll get eyes on you.