Presidential Gala
Parties celebrating a new U.S. President date back to the Washington Administration. Though some Presidents, like Woodrow Wilson and Warren G. Harding, have eschewed the custom, deeming it too excessive, the Inauguration Ball has become a staple of Washington's social calendar. Harry S Truman's ball, above, was held four years after he was sworn in; when he had taken office upon the death of Franklin Roosevelt in 1945, the atmosphere in the capital had been too somber for a party

• Photos: The Obamas Waltzing
• Michelle Obama's Jason Wu Dress