1. Swedish Midsummer Festival: June 24 marks the traditional Swedish holiday of Midsummer, celebrated annually in Delaware by the Swedish-American community since the early 1900s. The festival, held at Old Swedes Church in Wilmington, features traditional music, dancing, food, and a maypole.

2. Statehood Day: On June 24, 1784, Delaware became the first state to ratify the United States Constitution, which was later adopted as the supreme law of the land. Each year since, the day has been recognized as Statehood Day in Delaware.

3. Delaware River and Bay Lighthouse Foundation: Established on June 24, 1987, the Delaware River and Bay Lighthouse Foundation is a nonprofit organization dedicated to preserving and protecting historic lighthouses along the Delaware River and Bay.

4. Dover International Speedway: On June 24, 2001, Jeff Gordon won the MBNA Platinum 400 NASCAR race at the Dover International Speedway in Dover, Delaware. The speedway is home to two annual NASCAR race weekends.

5. First Person to Broadcast a Play-by-Play Baseball Game: On June 24, 1921, Graham McNamee became the first person to broadcast a play-by-play baseball game, covering a game between the Philadelphia Phillies and the Pittsburgh Pirates at Forbes Field in Pennsylvania. McNamee was born in Washington, D.C. but grew up in Wilmington, Delaware.