As Valentine’s season approaches, Alcina is more operatic astringent than aperitif, beginning as the ultimate revenge fantasy, featuring a dazzling siren who lures men onto her island and when she’s had enough, changes the hapless lovers into animals, vegetables or minerals. Newly appointed J. Ralph Corbett Professor of Opera Robin Guarino makes her CCM stage debut directing Handel’s 1736 opera, moving the setting 200 years forward into the era of Noel Coward’s classy ladies and clueless men. 8 p.m. Friday and Saturday and 2:30 p.m. Sunday. Free but reservations are required.