(Credit: Gran Theatre del Liceu/Bayerische Staatsoper/Metropolitan Opera) This weekend is stacked with a number of new productions and revivals with some of the biggest stars. Here is a look at seven works we think are unmissable. Guillaume Tell – Chorégies d’Orange, France Nicola Alaimo takes on Rossini’s final opera, a work that has become his signature. He is joined by {…}