Patriots Day is a holiday commemorating the anniversary of the Revolutionary War Battles of Lexington and Concord in Massachusetts.

These were the first battles of the American Revolutionary War and the quote “the shot heard ’round the world” refers to them. The battles occurred on April 19, 1775 but modern customs dictate that we celebrate on the third Monday of April so a three-day weekend can be enjoyed. It is a public holiday in Massachusetts and Maine.
To celebrate, re-enactors demonstrate how the battles were conducted, and the Boston marathon is run.