1. Statehood Day: May 20 is known as Statehood Day in Kansas as it marks the day when Kansas was admitted to the Union as the 34th state in 1861. The state celebrates this day with various events and activities.

2. First African American Mayor: On May 20, 1985, Richard Green became the first African American mayor of Wichita, Kansas. He served as mayor for two terms from 1983 to 1991 and remains an influential figure in Kansas politics.

3. Tornado Outbreak: On May 20, 2019, several tornadoes hit Kansas along with other parts of the Midwest. The outbreak caused significant damage to homes and businesses, and several people were injured.

4. Aviation History: On May 20, 1932, Amelia Earhart became the first woman to fly solo across the Atlantic Ocean. Her historic flight took off from Newfoundland, Canada, and landed in Northern Ireland, making her a national heroine in Kansas and beyond.

5. Brown v. Board of Education: On May 20, 1954, the U.S. Supreme Court issued its landmark decision in Brown v. Board of Education, which struck down segregation in public schools. The case originated in Topeka, Kansas, when a group of African American parents sued the local school board for its policy of segregation. The decision was a major victory for civil rights and marked a turning point in the fight against segregation.