1. Maine became the 23rd state to join the Union on August 20, 1820. The process of statehood was a long and contentious one, as Maine had been part of Massachusetts for decades and its separation was a subject of political debate for years. Finally, the Maine Statehood Act was signed into law by President James Monroe on March 15, 1820, and Maine officially became a state on August 20 of that year.

2. On August 20, 1862, the Battle of Rappahannock Station took place in Virginia during the American Civil War. This battle, which was part of the Second Bull Run campaign, saw Union forces under General John Pope attack Confederate positions near the Rappahannock River. Although the Union was ultimately unsuccessful in this engagement, it marked a significant moment in the war and helped to shape the course of events in the months that followed.

3. The first statewide suffrage referendum in Maine took place on August 20, 1917. This referendum, which asked the state's voters to decide whether women should be granted the right to vote, was narrowly defeated with 39% of the vote in favor and 61% against. However, it paved the way for future efforts to secure women's suffrage in Maine and across the country.

4. On August 20, 1969, the Gendron Franco Center for Heritage and the Performing Arts (formerly the St. Mary's Church) was listed on the National Register of Historic Places. This center, located in Lewiston, Maine, is a stunning example of Gothic Revival architecture and has served as a hub for cultural events and performances for over a century.

5. The Great Maine Balloon Festival takes place annually in Lewiston-Auburn over the weekend closest to August 20. This festival, which first began in 1992, features hot air balloon rides, food and craft vendors, live music, and other fun activities. It has become a beloved tradition for residents and visitors alike, drawing thousands of people to the area each year.