On November 21, the Società del Quartetto di Milano and international opera singers will present “Uniti per Verdi,” an event to save Sant Agata, Verdi’s home. The gala, which was organized by Ricardo Frizza and Francesco Meli will also feature Eleonora Buratto, Massimo Cavalletti, Roberto de Candia, Chiara Isotton, Roberta Mantegna, Caterina Piva, Piero Pretti, Annalisa Stroppa, Riccardo Zanellato, and {…}