- 1774 CW Glucks opera "Iphigenia in Aulis" premieres in Paris
- 1897 1st Boston Marathon (B.A.A. Road Race), won by John J. McDermott in 2:55:10; the world's oldest annual marathon inspired by success of the first marathon at the 1896 Summer Olympics
Bicycle Day - Swiss chemist Dr. Albert Hofmann deliberately takes LSD for the first time.
On April 19, 1943
Leslie Irvin of US makes first premeditated free-fall parachute jump
On April 19, 1919