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Mr. Gray, city officials and other pro-District marchers are also scheduled Saturday to join the Rev. Al Sharpton’s National Action Network March for Jobs and Justice at the Sylvan Theater on 15th Street and Independence Avenue Northwest.

Metropolitan Police officials said they will have extra officers in place over the weekend in anticipation of 50,000 or more visitors.

The Metro system will open two hours early Sunday, at 5 a.m., and run more eight-car trains to accommodate the influx of riders for the King memorial dedication, said agency General Manager Richard Sarles.

Mr. Sarles said riders heading to the memorial should consider using the L’Enfant Plaza or Arlington National Cemetery stops instead of getting off at the Smithsonian station, which is often busy, or at Foggy Bottom, which has ongoing escalator maintenance.

“The walk is about the same and the experience will be more pleasant,” he said.