March on Washington
The March on Washington was one of the largest political rallies in history. Remembered most famously for Martin Luther Kings Jr.'s "I have a Dream" speech, the rally was a major event in the push for Civil Rights. Approximately 250,000 people, 75% black, attended the march in Washington D.C. and experienced one of the biggest parts of the Civil Rights Movement.
The March on Washington helped pass the Civil Rights Act, led to the Selma to Montgomery marches, and helped pass the Voting Rights Act. This event was debatably the most important and most impactful event of the Civil Rights era.