Last night, satirical D.C. newcomers The Onion threw themselves a little D.C. fete to celebrate their recent local launch. Editor Joe Garden prefaced his welcoming remarks by relating that he had, on the previous evening, attended an event with “people from… Reuters and Bloomberg News” but that he was much happier spending his time with a few hundred of his new friends at the Black Cat. Well, of course he is! We all know what…