Pictures Delaware Valley Celebrates Martin Luther King Day Of Service January 20, 2014 / 2:32 PM EST / CBS News (credit: CBS 3) Students At Overbrook High School Honor Martin Luther King Day Of Service (credit: CBS 3) Volunteers In Camden Honor Martin Luther King Day Of Service (credit: CBS 3) Camden Celebrates Martin Luther King Day Of Service (credit: CBS 3) More Than 5000 People Volunteer At Girard College To Celebrate Day Of Service For MLK Day (credit: CBS 3)