1. On June 20, 1781, the Battle of Hubbardton took place during the American Revolution. It was a significant victory for the British forces, although they suffered heavy casualties.

2. June 20, 1837, marked the opening of the Vermont Central Railroad's first section, running from White River Junction to Bethel, Vermont. This was the first step towards connecting Vermont with the rest of the country by rail.

3. On June 20, 1850, Vermont's first Women's Rights Convention was held in Brattleboro. It was attended by approximately 200 women, who discussed issues such as women's suffrage and education.

4. June 20, 1923, was the birthdate of Vermont poet Galway Kinnell. Kinnell was a Pulitzer Prize winner and a MacArthur Fellow, known for his powerful and evocative poetry about nature and the human experience.

5. In 1973, Vermont became the first state to pass a law legalizing and regulating the sale of syringes without a prescription. This was an important step in preventing the spread of disease among intravenous drug users. The law went into effect on June 20 of that year.