Your sister's encouraged you to attend the largest performance of her life: she will debut every ballerina’s dream character, as Donatella di Fiore. She tells you to meet with her after the dance but never shows up! What’s occurred to your sister on this particular fateful night?
Get into the theater and find a cast of ghosts all attempting to tell something to you. A number are better at playing music than talking, so this could take some digging on your part... Save your sister from a decades-old curse so this doesn't become her last encore.