The organizers impressed upon the participants that the day honoring the civil rights leader wasn't a "day off" as much as a "day on" for a service project.
Fresh from a weeklong vacation, President Barack Obama has to confront such issues as the crisis in Egypt and federal spending before getting back out on the road to sell his economic proposals.
The antiquities authority in Egypt closed down the pyramid of Khufu, known as Cheops, the largest pyramid in the Giza Necropolis, after rumors surfaced about groups attempting to hold spiritual ceremonies there to mark the rare 11/11/11 date.