Thanks for the replies! A few more questions. . . .
How common was it for stars to provide their own costumes and when did it change to having the wardrobe department provide costumes? In my novel, a group of seamstresses runs around fitting everyone for their costumes, and when the show starts, a wardrobe attendant makes sure the MC has her costume. I rather like the scene with the wardrobe attendant, so I'm wondering how much of a stretch it would be for the Opera to provide the costumes for the leads. Could it be a newfangled idea they're trying out?
How many days a week would a opera singer typically perform? One who plays secondary parts, not the leads.
Is it unreasonable to depict an opera being produced in three weeks? I know I researched that when I first wrote it, but now I can't find where I pulled that number from. What I'm finding suggests that rehearsals take a bit longer than that, maybe 6-8 weeks. That throws off the timeline of my whole novel, so I'm wondering, can it be done in three stressful, chaotic, nerve-wracking weeks? Or is that too much pressure for the actors/singers, musicians, etc.?