Thought I would share. I double checked with Polk County Farms.I'm sure people bringing chickens don't have to pay but a vendor/ non-chicken swapper has to pay a fee to be there.
Here is the response I got:
Jennifer,
Patrick McLendon is in charge of the event and this is his reply- Its fine...
I know there is a farm store on site (or at least that is what I gather from the page I went to ) Are others allowed to come and sell goods? Or is this strictly a chicken swap event? I know you had said it's similar to Chickenstock so I was hoping to make another try at this since I got rained...