We have a auction sale, the evening after the Show! We have done this for years, so we advertise alot, and the buyers come an hour or 2 early for the sale and we supply and feed them supper! It seems to work pretty well!!
At our fair they have an auction for the market animals. They had to make their minimum weight requirement and they are sold in the order that they place and the species are broken up. So they're will be a couple sheep, a couple hogs, a goat, a cow, then a couple more sheep and it just keeps going until they are all done. We are not allowed to sell any animals privately while at fair.