Patriot Day is the day when a group of individuals spend the entire day (anywhere from 11 am to 11:30 pm) at the Patriot Cinemas in East Providence, RI. Because the theater shows second run movies one can spend the entire day watching movies for less than $10.
"The government authorized Patriot Day is tomorrow! Let's plan our Patriot Day on the actual Patriot Day!"
September 11, in recognition of the events of September 11, 2001. A kneejerk reaction to this sort of thing, in this author's opinion.
Patriot day happened, and nobody noticed.