"Dal Nilo al Tirreno" -- and back: With Verdi's "Aida" at the Colón, and Mozart's "Così fan tutte" at the Avenida, "Gli Operai" dedicate their fortnightly meeting to Ferrando's amourous aria ("Un'aura amorosa") and how belcanto evolved into a big heroic thing by the time of Radamès ("Celeste Aida"). With Luigi Speranza at the piano. 5 pm, St. Michael Hall, Calle 58, No. 611, La Plata.