As far as I know, Kanye West and Kim Kardashian are not San Francisco Giants fans, nor do they have any meaningful ties to AT&T or the city of San Francisco. And yet, Kanye decided to rent out the Giants' stadium in order to propose to Kim. A live orchestra was involved, and the jumbotron read "PLEEEASE MARRY MEEE!!!" Kanye West just does whatever the hell he wants.
Despite taking place in a stadium, the proposal was a rather intimate affair, and not many pictures are available. There is, however, this video clip of the orchestra in action, playing an instrumental version of "Knock me Down" by Keri Hilson:
Looks like a great time was had by all. Kim said yes, by the way.