1. In 1861, the Commonwealth of Kentucky declared neutrality in the Civil War. However, on May 20, 1861, Unionists led by Simon Bolivar Buckner took control of the state capital in Frankfort, ultimately leading to Kentucky's alignment with the Union cause.

2. The groundbreaking ceremony for the Kentucky State Capitol building was held on May 20, 1905. The construction of the Beaux-Arts building, designed by Frank Mills Andrews, was completed in 1910 and is now listed on the National Register of Historic Places.

3. On May 20, 1910, Joan O'Keefe became the first woman to receive a Bachelor of Science degree from the University of Kentucky. O'Keefe went on to have a successful career as a chemist, pioneer in the field of home economics, and advocate for women's rights in education.

4. The Kentucky Derby is often held on the first Saturday in May, but the 2020 edition was postponed due to the COVID-19 pandemic. The rescheduled event took place on September 5, 2020, marking the first time in history that the Kentucky Derby was held outside of the month of May.

5. On May 20, 2006, the Muhammad Ali Center opened in Louisville, Kentucky. The cultural center, named for the legendary boxer and humanitarian, features exhibits, films, and interactive displays that explore Ali's life and legacy. The center also promotes education, social justice, and personal growth.