What is the fine-grained topic of the following text: Ms. Voigt’s engagements in the New Year include her return to Barcelona’s Gran Teatre del Liceu in Wagner’s Tristan und Isolde (Jan 23, 27, 31; Feb 4, 8, 12, 16, and 20) and her debut at the Zurich Opera as the Diva and Ariadne in Strauss’s Ariadne auf Naxos (Feb; March 5, 9, and 14). Only return the topic.
Ms. Voigt's upcoming opera performances