The official inaugural weekend festivities began Saturday in Washington with a National Day of Service led by Obama and the first lady. The Obamas joined volunteers at a local D.C. elementary school, where they helped with rennovation projects.
Organizers said thousands of Americans participated in service events in conjunction with the inauguration across all 50 states. More than 13,000 people attended a so-called Service Summit on the National Mall.
Michelle Obama and Jill Biden also hosted a Kids Inaugural ball Saturday, carrying on a tradition started in 2009. The event was geared toward children of military families as part of Obama's "Joining Forces" initiative. A concert included performances by Usher, the cast of "Glee," and Katy Perry.
The stars will be out in force across Washington again on Monday, with performances at the inaugural cermony at the Capitol and at the official inaugural balls later in the evening.
At the ceremony, Beyoncé will sing the National Anthem, Kelly Clarkson will perform "My Country 'Tis of Thee," and James Taylor will sing "America the Beautiful."
The stars scheduled to perform at the various balls include Marc Anthony, Jennifer Hudson, Alicia Keys, John Legend, Stevie Wonder, and Smokey Robinson. Officials have not yet revealed who will perform for the president and first lady's inaugural dance.