The term is a compound noun, or noun phrase, in which "video" is the head noun. The proper noun "Patriots Day" functions as a noun adjunct, which is a noun used as a pre-modifier to describe the head noun.
In this construction, "video" is the core grammatical subject, identifying the medium. "Patriots Day" acts attributively, similar to an adjective, to specify the topic or category of the video. This grammatical structure is used to classify the object (the video) by its subject matter (the holiday). It distinguishes the item from, for example, a "Patriots Day article" or a "memorial service video," where either the subject or the medium is different.
Understanding this classification is essential for content development. Because "video" is the main noun, the article's primary focus should be on the visual media itselfits content, cinematography, distribution, or audience reception. The holiday provides the context, but the central theme is the video as an object of interest. This directs the article to analyze the media format, not just the event it portrays.
