Like many Hamfests, the Yuma Hamfest has Tailgating (or a swap meet or flea market if you prefer) where people sell their used stuff. Tailgating takes place outdoors on the fairgrounds. You must register to Tailgate 

The location of the majority of Tailgating will be on the west side of the Legacy Building. Tailgating hours are Friday, 12pm - 5pm and Saturday, 8am - 5pm. Other Tailgaters sell from their RV camping spots in the Dry Camping Area and Under the Covered Area F. Enjoy treasure hunting!!!