The core subject of the query, "Patriots' Day," is a proper noun. In Massachusetts, this official state holiday is observed on the third Monday in April.
The observance commemorates the anniversary of the Battles of Lexington and Concord, which took place on April 19, 1775, and marked the start of the American Revolutionary War. While historically linked to the fixed date of April 19th, Massachusetts state law was changed in 1969 to move the official observance to the third Monday of the month. This change aligned with the practice of creating three-day weekends for public holidays.
As a result, the specific date of the holiday varies each year, falling between April 15 and April 21. This day is marked by numerous civic ceremonies, historical reenactments, and school vacations. Most notably, the Boston Marathon has been held on this day since 1897, making the athletic event synonymous with the holiday's modern observance.
