1. The National Museum of African American History and Culture opened on October 3, 2016, in Washington, D.C. This museum features exhibits and programming that showcase African American culture, history, and experiences.

2. On October 3, 1961, President John F. Kennedy dedicated the federal building at 100 Pennsylvania Avenue NW, which housed the United States Postal Service headquarters until 1986. The building is now home to the Trump International Hotel D.C.

3. In 2013, the government shutdown began on October 3 and lasted for 16 days. This shutdown impacted government agencies and services in Washington, D.C., and throughout the country.

4. On October 3, 1981, the Washington D.C. police department arrested over 800 protesters at a demonstration against nuclear weapons. This mass arrest became known as the "Freedom of Expression" case and led to challenges to the constitutionality of mass arrests.

5. The groundbreaking ceremony for the John F. Kennedy Center for the Performing Arts took place on October 3, 1964. This iconic cultural institution hosts performances and events showcasing music, theater, and dance.