Dario Di Vietri is set to close the summer season with Puccini’s “Turandot.” The tenor will perform the opera at the Stara Zagora State Opera in Bulgaria on Sept. 4 in the evocative setting of the archaeological site of Seuthopolis, an ancient city founded by the Thracian King Seuthes III around 325-315 A.C. The Stara Zagora State Opera will perform {…}