By DCist Contributor Morgan Hungerford. DC is not a city of sample sales and trunk shows, so when we have one fashion-related event worthy of attendance it is Very Exciting; when we have two it is a Big Deal. And three? Well, you lucky, things, let’s just say you’d better take advantage. Tonight is the Third Thursday MidCity Shopper Social; shop the U Street Corridor and 14th Street for special deals at Junction. Wild Women…