Formerly Saint Marys Rock Shrimp Festival. The St. Marys Seafood Festival brings a full day of family fun in St. Marys, including a 5K and 10K run, a themed 10:00 a.m. parade featuring floats, fire trucks, tractors, and golf carts, and, of course, seafood concessionaires. You’ll also find entertainment, demonstrations, arts & crafts vendors, and more. A favorite part of the day will be the food! The restaurants will be offering seafood festival specials and there will be food trucks and vendors with sensational seafood fare. The Kiwanis Club will have a booth with several seafood choices. The festival is on the waterfront in St. Marys historic district and offers visitors a relaxing small-town feel.