The core subject of the query, "Patriots Day parade," functions grammatically as a noun phrase. In this construction, "parade" is the head noun, which identifies the type of event. The term "Patriots Day" is a compound proper noun that acts as an adjectival modifier, specifying the particular parade being referenced. The entire phrase serves to name a distinct, singular event.
The event is held on Patriots' Day, a civic holiday observed on the third Monday in April in Massachusetts, Maine, and Wisconsin. This date commemorates the anniversary of the Battles of Lexington and Concord, the first armed conflicts of the American Revolutionary War. Parades and historical reenactments are central to the holiday's observance, particularly in the towns of Lexington and Concord, Massachusetts.
While the holiday is consistently scheduled for the third Monday of April, the exact start times for individual parades vary by town and by year. For precise scheduling, it is necessary to consult the official municipal websites or local news sources for the specific community (such as Lexington or Concord) in the year the event is to be attended. The Boston Marathon is also held on this day, impacting regional travel and schedules.