The First Lady spoke at a screening of "The Powerbroker: Whitney Young's Fight for Civil Rights" at the Eisenhower Executive Office Building in Washington, DC yesterday. The screening was part of the celebrations commemorating the 50th anniversary of the March on Washington.
For the event, Mrs. O turned to a festive, mixed print summer frock, paired with two tone, open toe heels. The dress is not yet confirmed as such, but appears to be a new creation from Duro Olowu. The mix of prints is the designer's signature, while the shape and detailing of the dress appears similar to another Duro Olowu frock, seen here. Of note, it would appear Mrs. O has added subtle face-framing highlights.
Update: Mrs. O wears the "Roselda" dress from Duro Olowu's Spring Summer 2013 collection.