For 25 years, the Dupont-Kalorama Museums Consortium has been holding its annual Museum Walk Weekend to celebrate the two neighborhoods’ abundance of cultural centers. This Saturday from 10 a.m. to 4 p.m. and Sunday from 1 p.m. to 5 p.m., they celebrate the event’s 25th anniversary by providing free entrance to eight museums, as well as live music, food, demonstrations, walking tours, and other activities to encourage us all to indulge in our city’s excellent…