Wilmington State Parks will host free concerts twice a week this summer. The concerts are 6:30 p.m. Mondays at Rockford Tower in Rockford Park and 6:30 p.m. Wednesdays at the Sugar Bowl in Brandywine Park, south of the Brandywine Zoo. RELATED: Bellevue State Park announces summer concerts 42 nights of free music at the Rehoboth Beach Bandstand Free concerts, movies and …