CHARIS TO SING MODERN CHORAL CLASSICS Charis Chamber Voices offers two major contemporary works for chorus and string orchestra on its Spring program: Tarik O’Regan’s Triptych and Arvo Pärt’s Berliner Messe. Charis’s Artistic Director, Jeremy Wiggins, conducts, Saturday, May 3 at 4:00 p.m. at Irvington Presbyterian Church, 25 North Broadway, Irvington, NY, and Sunday, May 4, at 4:00 p.m. at First Presbyterian Church of New Canaan, 178 Oenoke Ridge Road, New Canaan, CT. O’Regan, born and educated in Britain and…