1. On September 20, 1756, the French and Indian War came to Maryland when Fort Frederick was attacked by a large group of Native Americans and French soldiers. The fort was eventually saved by reinforcements from neighboring forts, but the attack was a significant moment in Maryland's involvement in the war.

2. On September 20, 1862, the Battle of Shepherdstown was fought near the Potomac River in Maryland during the Civil War. The battle resulted in a Union victory, and it was the last Confederate attempt to invade the North.

3. The Maryland Agricultural College (now known as the University of Maryland) opened on September 20, 1859. At the time, it was only the second public land-grant university in the United States.

4. On September 20, 1957, Baltimore Orioles pitcher Hoyt Wilhelm threw a no-hitter against the New York Yankees. It was the first no-hitter in Orioles franchise history.

5. The first-ever Maryland Renaissance Festival opened on September 20, 1975, in Crownsville, Maryland. The annual festival has since become a beloved tradition for Marylanders and visitors alike, featuring jousting, period-themed entertainment, and delicious food and drinks.