1. Ethan Allen's Capture: August 21, 1775 was the day when Ethan Allen, the founder of the Green Mountain Boys, led his troops into Ticonderoga and captured the fort without firing a single shot. This event played a significant role in the Revolutionary War and is still celebrated today as "Ethan Allen Day."

2. First Ski Shop in Vermont: On August 21, 1938, the first ski shop in Vermont opened in Manchester. The shop was owned and operated by John Ignatius "Jack" Fraser. Fraser was a pioneer in the ski industry and is considered to be one of the godfathers of modern skiing.

3. Hurricane Diane: On August 21, 1955, Hurricane Diane struck Vermont, causing widespread flooding and destruction. The hurricane claimed the lives of 13 people and caused over $25 million in damages. The storm was one of the worst natural disasters in Vermont's history.

4. First Factory Water-Powered Lights Installed: On August 21, 1884, the first factory in America to be lit by electricity produced from water power was installed in Winooski. The Winooski Mill Company used a new type of lighting called the Edison-Lalande system, which allowed for the factory to stay open for longer hours and increase production.

5. Vermont State Fair: The Vermont State Fair begins on August 21 every year and runs for 10 days. The fair is held in Rutland and attracts thousands of visitors from all over the state. The fair features agricultural exhibits, carnival rides, live music, and a wide variety of food vendors.