1. In 1963, Dr. Martin Luther King Jr. delivered his "I Have a Dream" speech on the steps of the Lincoln Memorial to over 250,000 civil rights protesters. The historic march on Washington was a pivotal moment in the civil rights movement and is remembered as one of the largest political rallies for human rights in United States history.

2. On August 13, 1877, the first commercial telephone switchboard in the world began operation in the District of Columbia. The switchboard, located at Connecticut Avenue and L Street NW in Washington D.C., facilitated communication between businesses and residents by connecting phone calls manually using a patch cord.

3. The Washington Nationals baseball team made history on August 13, 2017, when they defeated the San Francisco Giants 6-2 in a game that featured two consecutive home runs by Bryce Harper and Ryan Zimmerman. The back-to-back home runs marked the first time in Nationals history that two players hit home runs on consecutive pitches.

4. The District of Columbia celebrates Emancipation Day on April 16th, commemorating the day in 1862 when President Abraham Lincoln signed the District of Columbia Emancipation Act, which freed nearly 3,000 slaves in the District. However, on August 13, 1863, a year later, The Compensated Emancipation Act took effect, freeing an additional 3,100 slaves in the District.

5. August 13, 1994, marked the opening of the Smithsonian's National Air and Space Museum's Steven F. Udvar-Hazy Center in Virginia, adjacent to Dulles International Airport. The center houses numerous historic aircraft and spacecraft, including the Space Shuttle Discovery, the Enola Gay, and the SR-71 Blackbird. The center is named after a prominent aviation industry executive, Steven Udvar-Hazy.