Public Lands Day is a state observance in Colorado, celebrated on the third Saturday of May. It recognizes the importance of public lands in the state. (https://www.timeanddate.com/holidays/us/public-lands-day)

Armed Forces Day is observed annually on the third Saturday of May to honor men and women who serve in the U.S. military. (https://www.timeanddate.com/holidays/us/armed-forces-day)

The Preakness Stakes is an annual Thoroughbred horse race held at Pimlico Race Course in Baltimore, Maryland. It is the second event in the Triple Crown series. (https://www.timeanddate.com/holidays/us/preakness-stakes)

Emergency Medical Services for Children Day raises awareness about the need for specialized emergency care for children. (https://www.timeanddate.com/holidays/us/medical-service-children-day)

National Maritime Day recognizes the maritime industry and the benefits it brings to the country. It honors ships and seafarers significant to the nation's history. (https://www.timeanddate.com/holidays/us/national-maritime-day)

Harvey Milk Day is observed in California on May 22 to celebrate the achievements of Harvey Milk, a gay rights activist. (https://www.timeanddate.com/holidays/us/harvey-milk-day)

National Missing Children's Day raises awareness of the threat of child abduction and emphasizes the importance of child safety. (https://www.timeanddate.com/holidays/us/national-missing-children-day)