Yahoo! News will make a splash in the District next week with a rooftop fete at 101 Constitution Ave.  Few details about the invite-only soiree were offered in an invitation headlined “We’ve got news to share” but judging by the newsgroup’s selection of Philip Dufour as event planner, the party will be an affair to remember.  Dufour, former social secretary for Al and Tipper Gore, was the mastermind behind many of the city’s most memorable celebrations.  His company was responsible for BBC’s RTCA after-party in 2010, MSNBC’s 2010 WHCD fete and 2009 RTCA after-party, and the black-tie grand re-opening of Georgetown’s Social Safeway.  In short, you had us at “Dufour,” Yahoo.