1. The Battle of Seattle: On August 6, 1856, tensions between native tribes and incoming settlers escalated into violence during the Battle of Seattle. The fighting lasted for six hours and resulted in the death of several people on both sides.

2. Women's Equality Day: August 6th is recognized as Women's Equality Day in Washington State. This day commemorates the passage of the 19th Amendment to the U.S. Constitution, granting women the right to vote.

3. Hanford Nuclear Reservation: August 6, 1945, marked the dropping of the atomic bomb on Hiroshima, Japan, leading to the establishment of Hanford Nuclear Reservation in Washington State. The site played a crucial role in the production of plutonium for the United States' nuclear weapons program.

4. World's Fair: On August 6, 1962, the Seattle World's Fair officially closed after six months of exhibits, performances, and attractions. The fair brought in over 10 million visitors from around the world and cemented Seattle's status as a major global city.

5. Harry Bridges Memorial: The Harry Bridges Memorial, located in Seattle, was dedicated on August 6, 1993. Bridges was a longshoreman and labor leader who was instrumental in organizing the West Coast waterfront during the 1920s and '30s. The memorial honors his contributions to the labor movement and civil rights.