The keyword phrase "Patriots Day CDA" functions as a proper noun. It operates as a single semantic unit to identify a specific, named event: the Patriots Day observance located in Coeur d'Alene (CDA), Idaho. As a proper noun, it names a unique entity, distinguishing it from other Patriots Day events or general commemorations.
Grammatically, the phrase is a compound noun construction. The core element is the proper noun "Patriots Day," which is the name of a civic holiday. The initialism "CDA" serves as a postpositive noun adjunct, a modifier that follows the noun it describes. Its function is to specify the location, thereby narrowing the reference from the general holiday to the particular event held in Coeur d'Alene. Similar to constructions like "Boston Marathon" or "Sundance Film Festival," the entire phrase is treated as a single title or name.
For the purpose of an article, identifying "Patriots Day CDA" as a proper noun is crucial because it establishes the phrase as the primary subject. This classification dictates that the article's content will describe, explain, or provide history on this specific event. All associated verbs, adjectives, and clauses in the article will relate back to this singular subject, ensuring the focus remains on the who, what, when, and where of the Coeur d'Alene Patriots Day event itself.
