Maybe it is because the Meridian International Center encourages global dialogue and international understanding; maybe it is because it is housed in an old, welcoming mansion on a hill on 16th Street. The Meridian Ball, the 44th on Oct. 12, never fails to delight and bring people together. After the dinners at embassies and in the mansion, crowds met for dancing and catching up, D.C.-style, even as some listened to the Nationals’ final game. Inside, Peter Duchin led his band to quieter fare which also included some Lady Gaga. Outside in the dance tent, DJ Pitch One spun some disco, hip hop tunes as well as the latest — getting upright Washingtonians to do it “gangnam-style.” And congrats to Ashley Taylor Bronczek, who was jetting off on her honeymoon the next morning.