The keyword term "Patriots Day shutting down Boston" functions grammatically as a noun phrase. This classification is critical because it treats the entire concept as a single, identifiable event or phenomenon, making it suitable as the subject of an article.
This noun phrase is constructed around a central gerund phrase, "shutting down Boston." In this construction, "shutting down" is a present participle of the verb "shut down" that functions as a noun (a gerund), representing the action or process. "Boston" serves as the direct object of this action. The proper noun "Patriots Day" acts as a noun adjunct, modifying the gerund phrase by specifying the context or time of the event. The entire structure combines these elements to name a specific, recurring event.
By identifying the term as a noun phrase, it can be used as the central subject for analysis within the article. This allows for the construction of clear, declarative sentences where the event itself is the primary focus. For instance, the article can state, "[Patriots Day shutting down Boston] has significant economic implications" or "The logistics of [Patriots Day shutting down Boston] are complex," treating the phrase as a singular entity to be examined.