1. The Boston Marathon Bombing: On April 27, 2013, the Boston area found itself the victim of a terrorist attack when two bombs exploded near the finish line of the Boston Marathon. Three people were killed and over 260 others injured.

2. The Salem Witch Trials: On April 27, 1692, a warrant was issued for the arrest of Elizabeth Proctor, John Proctor's wife, for witchcraft in Salem, Massachusetts. The Salem Witch Trials were a series of hearings and prosecutions of people accused of witchcraft in colonial Massachusetts.

3. Red Sox Begin Their Winning Streak: On April 27, 2017, the Boston Red Sox began a 19-game winning streak, which is the longest in the team's history. The streak included a sweep of the New York Yankees at Fenway Park.

4. Ford Building in South Boston Burns Down: April 27, 1987, marked the day that the Ford Building in South Boston burned down. The fire was so intense that firefighters had to fight it from outside the building. The building, which was a century-old former factory, was scheduled for demolition.

5. American Revolutionary War: On April 27, 1777, the Battle of Ridgefield, Connecticut, took place. This battle was a part of the American Revolutionary War and saw the British troops led by General Tryon retreating after being attacked by American forces. The battle marked a significant moment in the war and helped to boost the morale of the American soldiers.