Question: What annual Austrian society event which takes place in the building of Vienna State Opera in Vienna was featured in the made-for-TV movie Opernball?
Sentence (from "Opernball (film)"): The film starred Heiner Lauterbach, Franka Potente, Frank Giering, Caroline Goodall, Richard Bohringer, Gudrun Landgrebe and Désirée Nosbusch.
Relevant evidence: No