They started closing down the streets around the museum on Friday to prepare for this event. For example, there are more port-a-potties than I've ever seen in one place! City officials expect as many as 100,000 people for the event. Via the Philadelphia Inquirer: Vice President Kamala Harris will close out her presidential campaign in Philadelphia Monday night, where she’ll be joined by a star-studded cast of musicians and celebrities. The concert and rally, which is scheduled to begin at 5 p.m.