You could put the craft fair fee in Other Rent. The fee is for renting the space. But everything doesn't have to fit into one of the predefined categories. After the expense categories there is a place to enter miscellaneous expenses with a description. You could enter it there and call it "Craft fair fee."
Exactly where you find the miscellaneous expenses depends on what version of TurboTax you are using, which you didn't indicate.
