LOCAL SPORTS SCHEDULE MIAA Playoff Football Friday Methuen at St. John’s Prep, 6 p.m. Marblehead at Grafton, 6 p.m. Lynnfield at Fairhaven, 6 p.m. Newburyport at Shawsheen, 6:30 p.m. Amesbury at Mashpee, 7 p.m. Saturday Swampscott vs. Stoneham at Woburn High,…