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When I looked at that site a few days ago, the list they showed indicated which of them were the ten "OFFICIAL" balls.. For some reason, they'd deleted the word "Official" from their list..
http://www.dressregistry.com/?drfunc=event&drsfunc=reset01-21-2009 Inaugural Ball American Indian Inaugural Brunch
01-20-2009 Inaugural Ball All American Ball
01-20-2009 Inaugural Ball American Indian Inaugural Ball
01-20-2009 Inaugural Ball Ancestors Dream Inaugural Ball
01-20-2009 Inaugural Ball Arizona Inaugural Gala
01-20-2009 Inaugural Ball Bidens Home State Inaugural Ball
01-20-2009 Inaugural Ball Bipartisan Inaugural Gala Celebration of American Agriculture
01-20-2009 Inaugural Ball BSA Presidential Inaugural Ball
01-20-2009 Inaugural Ball Commander-in-Chief Ball
01-20-2009 Inaugural Ball Concerned Black Men National Organization & Federal City Alumnae Chapter Delta Sigma Theta Sorority, Inc. Inaugural Gala
01-20-2009 Inaugural Ball Constitution Ball
01-20-2009 Inaugural Ball Democracy Ball
01-20-2009 Inaugural Ball Eastern States Inaugural Ball
01-20-2009 Inaugural Ball Freedom Ball
01-20-2009 Inaugural Ball Garden State Inaugural Gala
01-20-2009 Inaugural Ball George Washington University Ball
01-20-2009 Inaugural Ball Grits and Granite Inaugural Ball
01-20-2009 Inaugural Ball Hawaii Presidential Inaugural Ball
01-20-2009 Inaugural Ball Heroes Red, White and, Blue Inaugural Ball
01-20-2009 Inaugural Ball Inaugural Celebration
01-20-2009 Inaugural Ball Independence Ball
01-20-2009 Inaugural Ball Liberty Ball
01-20-2009 Inaugural Ball Mid-Atlantic States Inaugural Ball
01-20-2009 Inaugural Ball Midwest States Inaugural Ball
01-20-2009 Inaugural Ball Neighborhood Inaugural Ball
01-20-2009 Inaugural Ball Obama Home States Inaugural Ball
01-20-2009 Inaugural Ball Patriot Ball
01-20-2009 Inaugural Ball Pennsylvania Society Inaugural Ball
01-20-2009 Inaugural Ball Presidential Inaugural Ball
01-20-2009 Inaugural Ball PYIC Inaugural Ball
01-20-2009 Inaugural Ball Southern States Inaugural Ball
01-20-2009 Inaugural Ball St. Louis Inaugural Ball
01-20-2009 Inaugural Ball Stars and Stripes Ball
01-20-2009 Inaugural Ball Veteran's Inaugural Ball
01-20-2009 Inaugural Ball Western States Inaugural Ball
01-20-2009 Inaugural Ball Youth Inaugural Ball
01-19-2009 Inaugural Ball 2009 Green Inaugural Ball (hosted by Al Gore)
01-19-2009 Inaugural Ball Arkansas State Society Inaugural Party
01-19-2009 Inaugural Ball Florida Sunshine and Stars Inaugural Ball
01-19-2009 Inaugural Ball Georgia Inaugural Gala
01-19-2009 Inaugural Ball Illinois Presidential Inaugural Gala
01-19-2009 Inaugural Ball Indiana State
01-19-2009 Inaugural Ball PA Democratic Party YES WE DID! Celebration
01-19-2009 Inaugural Ball South Carolina Presidential Inaugural Ball
01-19-2009 Inaugural Ball Texas State Society Black Tie & Boots Inaugural Ball
01-18-2009 Inaugural Ball African American Church Inaugural Ball
01-18-2009 Inaugural Ball Disability Power and Pride Inaugural Ball
01-18-2009 Inaugural Ball Latino Inaugural Gala
01-18-2009 Inaugural Ball Maryland Democratic Party Inaugural Ball
01-18-2009 Inaugural Ball Metropolitan Gala on the Georgetown Waterfron
01-18-2009 Inaugural Ball The California Bash
01-17-2009 Inaugural Ball The Peoples Inaugural Ball
01-16-2009 Inaugural Ball The Catholic University of America 2009 Inaugural Ball