The State Department will be holding another of its popular Tech@State Events on February 11. This event will focus on Open Source with speakers from State, NASA, Google and others. After the first day at the State Department in Washington D.C., there will also be a free-flowing "unconference" at the National Democratic Institute.
See this link for program details and (free) registration. These events tend to sell out, so you are advised to register well in advance.