A lot of great suggestions. One I'll add to the list:
The Marine Corps sunset parade at the USMC War Memorial aka Iwo Jima Monument. I believe it is every Tuesday in the summer. Looking at the website it looks like the Memorial is under renovations, so this year they are at the Lincoln Monument.
Tuesday Sunset Parades will be held at the Lincoln Memorial along the National Mall in Washington D.C. for the summer of 2019 with the exception of those on June 25th, July 2nd, and July 9th. Stay tuned for the location of those parades.
The Sunset Parades are conducted on Tuesdays beginning June 11 through Aug. 13, 2019 and the start time will be the same as previous years, 7:00 pm.
**The Sunset Parades on Aug. 6 and 13 begin 30 minutes earlier.**
A one hour performance, the Sunset Parade features the music of "The Commandant's Own", The United States Marine Drum and Bugle Corps and precision drill by the Marine Corps Silent Drill Platoon.
The Sunset Parade is open to the public at no charge. Reservations are not necessary. The spacious steps on the Lincoln Memorial and surrounding lawns provide ample room for guests to bring lawn chairs for an informal viewing. No other type of seating is available, except for invited guests of the Parade Reviewing Officials.
A similar event is also held on Friday's at the Marine Barracks @ 8th and I.
A one hour and fifteen minute performance of music and precision marching, the Evening Parade features "The President's Own" United States Marine Band, "The Commandant's Own" The United States Marine Drum and Bugle Corps, the Marine Corps Color Guard, the Marine Corps Silent Drill Platoon, Ceremonial Marchers, and Cpl. Chesty XV, the official mascot of Marine Barracks Washington.
The ceremony starts at 8:45 p.m., beginning with a concert by the United States Marine Band. The Evening Parade, held every Friday evening during the summer, has become a universal symbol of the professionalism, discipline, and Esprit de Corps of the United States Marines.
