Holiday – Patriots’ Day

Patriots Day is held each year on the third Monday in April to commemorate the battle of Lexington and Concord, the first shots fired in the American Revolutionary War. Massachusetts residents take a holiday to celebrate American history and watch the Boston Marathon, one of the most well-known sporting events in the world.

— Massachusetts Office of Travel and Tourism, https://www.visitma.com/things-to-do/holidays/patriots-day/