The keyword term "Patriots' Day Massachusetts" functions grammatically as a proper noun phrase. This classification is the main point for determining its role within an article.
The phrase is a compound construction. "Patriots' Day" is the core proper noun, naming a specific public holiday. The word "Massachusetts," itself a proper noun, acts as a noun adjunct (or adjectival noun) in this context. Its function is to modify "Patriots' Day," specifying the exact geographic and legal jurisdiction where this particular observance occurs. The entire phrase operates as a single unit to name a unique entity.
Treating the term as a proper noun phrase is crucial for the article's focus. It establishes the subject as a singular, specific event tied to a particular place. This dictates that the article's content should address the unique history, traditions (such as the Boston Marathon), and civic meaning of this holiday as it exists specifically within the Commonwealth of Massachusetts, rather than a generic concept.
