Craft fairs can be an excellent way to sell your home created items and homegrown produce.
By way of homegrown produce: You can add value to foods grown by turning them into jams and jellies, vinegars and syrups, pickles and sauces, and so forth. For the more advanced practitioner, you could make cheeses, olives in brine, smoked meats, and the like.
By way of homemade produce: You can make lots of items using sewing, embroidery, woodwork, metal smithing, paper, repurposing, and so forth.