1. On September 16, 1620, the Mayflower ship arrived in Provincetown Harbor in present-day Massachusetts. This marked the beginning of the Pilgrims' historic journey and their settlement in the New World.

2. In 1755, the Battle of Lake George took place in New York, but it had significant consequences for Massachusetts. The British forces won the battle, which helped secure their control over Albany and protected Massachusetts from further French attacks.

3. September 16, 1774, was a significant date in Massachusetts history as it marked the first meeting of the Provincial Congress in Salem. This congress paved the way for the establishment of the Massachusetts Revolutionary government, which ultimately led to the American Revolution.

4. On September 16, 1848, the first convention of women's rights in the United States was held in Worcester, Massachusetts. The convention was organized by Lucretia Mott and Elizabeth Cady Stanton and led to the formation of the women's suffrage movement.

5. September 16, 1957, was the date of the Dedication of the Quabbin Reservoir in Massachusetts. This massive water supply project was the result of a 30-year-long construction effort and created a reservoir that supplies water to nearly half of Massachusetts' population. The Dedication of the Quabbin Reservoir was a significant moment in the state's history and celebrated the creation of an essential resource that has helped support the region's growth and development.