It’s festival season and that means many stars are heading over to major companies to make role debuts, perform signature roles, or simply make important debuts with companies. Here is a look at what OperaWire recommends for this weekend. Nabucco – State Opera Stara Zagora, Bulgaria  Maria Guleghina takes on her signature role of Abigaille alongside Romanian baritone Ionut Pascu and bass Ivailo {…}