I live in LA. Thanks for feedback. I think contacting organizers is the way to go. Finding them might be the hard part!
Hello. Since very seldom a picture of two (four) people will show all the grandeur of the event, I use to make a poster with the building (or the room) besides the couple. And below, the title: Ball der Wiener Philarmoniker 2012, for example. The customers like it very much
I find that buildings are more appealing by night. Good luck.