It's a combination yard sale/flea market/trade days/...you get the point. It takes place on the El Camino Real, that runs from Natchitoches through Nacogdoches.
It's the Christmas shopping season, the weather will be warm and gorgeous, and flea markets are just plain fun. All of those things are expected to factor into huge crowds this weekend at First Monday Trade Days in Canton. It might be worth the drive.