phrase1: major house
phrase2: grand theater
sentence1: May 1942 would see Guerrini's first appearance at a major house—Teatro Massimo (Palermo)—in "La Forza del Destino" and also in concert.
sentence2: May 1942 would see Guerrini's first appearance at a grand theater—Teatro Massimo (Palermo)—in "La Forza del Destino" and also in concert.