MOST POPULAR: Video, stories and more
SIGN-UP: Get breaking news sent to you from ABC7
More than 4,000 national and international volunteer and service leaders are expected for the three-day conference at the Moscone Center.
The event also kicks off United We Serve, a national call to community service from President Obama.
Earlier on Monday, Michelle Obama will join California's First Lady Maria Shriver to participate in the building of a playground at San Francisco's Bret Harte Elementary School.
Today's latest headlines | ABC7 News on your phone
Follow us on Twitter | Fan us on Facebook | Get our free widget
