The keyword phrase "patriots day parade laguna" functions grammatically as a noun phrase. The main point and core part of speech within this phrase is the head noun: parade. The other words in the term act as modifiers to specify the nature and location of this central subject.
In this grammatical construction, "parade" is the head noun that identifies the core subject as a public procession. The term "Patriots Day" is a compound noun functioning as a noun adjunct (a noun used as an adjective) to specify the theme or occasion of the parade. Likewise, "Laguna" is a proper noun, also acting as a noun adjunct, which modifies the head noun by designating its geographic location. These modifiers work together to narrow the focus from a general event to a specific, identifiable one.
For the purpose of writing an article, recognizing "parade" as the main subject is critical. This structure dictates that the article's central focus should be the event itselfits components, participants, history, and spectacle. The modifiers "Patriots Day" and "Laguna" provide the essential context, defining the "what" and "where," but the narrative core should revolve around the parade as the primary topic.