The UM Opera Workshop will present “Amahl and the Night Visitors” Nov. 17–18 at 7 p.m. at First Baptist Church, North Mobile, in Saraland. Guest conductor will be Bernard McDonald of London, who conducted “Amahl” for the Opera Theater of Pittsburgh in 2005 and served as chorus master of Glyndebourne, the No. 2 opera company in the United Kingdom, from…