They call me at work (I don't have my own phone so it's a switchboard). I don't like that--it's embarrassing and time-consuming for my colleagues to have to field these calls. I don't recall giving them my work phone number.
Yes, it is the SF Opera. Very annoying. Called around 9 PM once, and also the weekend. It's pathetic. I like watching the opera, and I support the opera, but these phone calls are just harassment. They have to pick a better time to call people. Not 9 in the evening.
Called WHILE I was in the audience at the opera! Fortunately my phone was silent, of course. Added them to my "reject" list, which my new phone blessedly has.