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 "Vienna Opera Ball"): The Vienna Opera Ball (German: "Wiener Opernball") is an annual Austrian society event which takes place in the building of the Vienna State Opera in Vienna, Austria on the Thursday preceding Ash Wednesday (a religious holiday).
Relevant evidence: Yes