(WILLIAMSTOWN and GREAT BARRINGTON, Mass.) – Verdi’s sweeping romantic opera Ernani will be screened at The Clark and the Mahaiwe on Saturday, February 25, 2012, at 1p.m., Live in HD from the Metropolitan Opera. (There will be an encore screening at the Mahaiwe on Wednesday, March 7, at 1 p.m. at the Mahaiwe.) In Ernani,…