The keyword phrase "patriots day on calendar" functions as a noun phrase. The main point or head of this phrase is the proper noun "Patriots Day," which names a specific holiday.
Grammatically, the phrase is constructed with the proper noun "Patriots Day" followed by the prepositional phrase "on calendar." The preposition "on" links the noun "calendar" to "Patriots Day." In this structure, the prepositional phrase acts as a post-modifier, providing additional, specific information about the head noun. It clarifies the context in which "Patriots Day" is being consideredspecifically, its placement or representation within a calendar.
Understanding this structure is crucial because it establishes the article's subject as a distinct concept or entity. By functioning as a noun phrase, it can serve as the subject or object in a sentence, clearly identifying the topic as the holiday's specific date, scheduling, or observance as recorded on a calendar, rather than just the historical event itself.