Market Madness will be held March 9 and 10 at the Ocean City Music Pier, Moorlyn Terrace and the Boardwalk. Created by the city s Boardwalk and Downtown Merchants Associations, it will offer two days of preseason shopping specials from local stores from 10 a.m. to 5 p.m. Saturday and 10 a.m. to 3 p.m. Sunday.