The keyword phrase "patriots day mass" functions as a noun phrase. Specifically, "Patriots' Day" is a compound proper noun referring to a specific state holiday, and "Mass" is an abbreviation for Massachusetts, also a proper noun, serving as an appositive or a geographical identifier for where the holiday is primarily observed. Therefore, the entire phrase identifies a particular event and its primary location.
Patriots' Day is a civic holiday primarily observed in the Commonwealth of Massachusetts (and also in Maine), commemorating the anniversary of the Battles of Lexington and Concord on April 19, 1775. These engagements marked the official beginning of the American Revolutionary War. The holiday is celebrated on the third Monday of April, making it a long weekend. While its historical significance lies in the commemoration of the "shot heard 'round the world," in contemporary Massachusetts, Patriots' Day is perhaps most famously associated with the running of the Boston Marathon. This renowned athletic event has become an integral part of the holiday's modern observance, drawing participants and spectators from around the globe to the state.
The observance of Patriots' Day in Massachusetts is a unique blend of historical remembrance and community celebration. It serves as a reminder of the state's pivotal role in the American Revolution, fostering a sense of civic pride and historical awareness. The juxtaposition of solemn historical commemoration with the festive and challenging Boston Marathon creates a distinctive cultural experience that is deeply embedded in the identity of Massachusetts.