Since 1969, Patriot’s Day has been observed on the third Monday in April in Maine, and also Massachusetts.
Patriot’s Day is a special observance that commemorates the battles of Lexington, Concord, and Menotomy, the inaugural battles of the American Revolutionary War.
The Monday holiday creates a three-day long weekend. State and most local town/city offices are closed for the holiday. Since the holiday is not a Federal one, Federal offices, including the Post Office, will be open. Banks may be open, as well as retail stores.
The Boston Marathon is also run on Patriots’ Day, as it has every year, since its inception in 1897.