ST. PETERSBURG — St. Petersburg’s Saturday Morning Market will be moved to Williams Park, 350 Second Ave. N, on Saturday as the city finalizes preparations for the March 9-11 Grand Prix of St. Petersburg. Market hours are 9 a.m. to 2 p.m. The market will be closed March 10 for the Grand Prix, and will reopen at 9 a.m. on March 17 in its regular Al Lang Stadium parking lot location at 230 First St. SE. Now in its 15th season, the Saturday Morning Market has become the largest in the southeast U.S. with approximately 10,000 weekly customers.