Consider attending a political event. You'll be surrounded by only the socially adept who will all be forced to at least talk to you momentarily. Watch as they work a room. A relatively cheap donation will get you invited. Consider it a training fee. You'll learn more about power and interpersonal relationships in a night than a month of sitting by yourself at the bar.

btw - I second that this is a skill that does not come from books. It requires real effort on your part.