1. June 21 is the summer solstice, the longest day of the year, and traditionally celebrated in Vermont as the first day of summer.

2. In 1781, on this day, Ethan Allen, the famed Revolutionary War hero and leader of the Green Mountain Boys, died in Burlington, Vermont.

3. On June 21, 1911, Vermont became the first state to establish a workers' compensation law, which provided benefits to employees injured on the job.

4. In 1972, the U.S. Supreme Court ruled in Vermont Yankee Nuclear Power Corp. v. Natural Resources Defense Council that the Atomic Energy Act of 1954 preempted state regulation of nuclear safety.

5. On June 21, 1983, the first annual Vermont Mozart Festival began in Burlington, a two-week celebration of classical music that continues to this day.