The keyword term "september holiday" is a noun phrase. The core component and main point of this phrase is the noun "holiday." The word "september" functions as an adjective, specifically a noun adjunct, modifying "holiday" by specifying its temporal context.
In this grammatical construction, "holiday" serves as the head of the phrase, establishing the primary subject matter. The modifier "september" acts as a specifier, narrowing the scope of the head noun. It answers the question "Which holiday?" by defining it as one that occurs within the month of September. This distinguishes it from other holidays categorized by season (e.g., "winter holiday") or type (e.g., "federal holiday"). The syntactical relationship is crucial: the focus is not on the month itself, but on the event that takes place during that month.
For the article, this determination dictates that the central theme must be the holiday as an event, entity, or concept. The adjective "september" provides the specific frame of reference. Therefore, the content should not be about the month of September in general, but should instead analyze, describe, or discuss specific holidays that fall within it, such as Labor Day in the United States, various independence days in Latin America, or the Mid-Autumn Festival in East Asia, depending on the article's scope.
