Okay so it's close to the opera thing but...
Maybe they could go see the Metropolis Philharmonic?
Or a dance performance? I mean, my vote would definitely be for the opera but if you don't like that idea...
I live in NYC right near Lincoln Center...if you really want more inspiration, you could maybe go on their website and see what other kinds of events they have going on there. It's all very upscale and formal type stuff.
