The Treasure Coast Marine Flea Market and Boat Show Announces 2022 dates as the 14th annual event is set for October 8-9 at Indian River Fairgrounds in Vero Beach, Florida. For two days, Oct. 8-9 the 139-acre fairgrounds will be transformed into the Treasure Coast's largest nautical "Flea Market." For boat owners, fishermen, divers and anyone with an interest in all things nautical, the Treasure Coast Marine Flea Market is a bargain hunter's dream come true. Private individuals and marine-related businesses sell used marine equipment, marine antiques, new and used boats, fishing tackle, diving gear, marine artwork and other boating related items at unbelievably low prices.at Show.