1. Armistice Day: November 11th is celebrated as Armistice Day, marking the end of World War I in 1918. It was observed as a federal holiday until 1954 when it was renamed Veterans Day to honor American veterans of all wars.

2. March on the Pentagon: On November 11, 1967, anti-war protesters marched on the Pentagon in Washington D.C. to demand an end to the Vietnam War. The peaceful protest turned violent as police used tear gas and batons to break up the crowd.

3. Smithsonian Museums: November 11th is a special day for the Smithsonian museums in D.C., as they offer free admission to all visitors to commemorate Veterans Day. The Smithsonian is the largest museum complex in the world, with over 19 museums and galleries.

4. Presidential Election: November 11, 2008, marked a historic election as Barack Obama was elected as the first African-American President of the United States. His victory marked a significant moment in D.C. history and was celebrated by many in the city.

5. Women's Suffrage: On November 11, 1919, the Senate passed the 19th Amendment, granting women the right to vote. This was a major milestone in the fight for women's rights and paved the way for further women's equality movements in D.C. and across the country.