12-29 May: Don Carlo. Bertrand de Billy conducts a cast led by Bryan Hymel and Krassimira Stoyanova in Nicholas Hytner’s acclaimed production of Verdi’s opera set in 16th-century Spain. Check for times and prices. www.roh.org.uk. Bow St, WC2E 9DD. T: 020-7304 4000. D8. Station: Covent Garden.