Russian Printing Industry Day is a Russian professional holiday celebrated on April 19. It was officially established in April 2013 on the initiative of Russian printing industry professionals and with the support of the Ministry of Culture of the Russian Federation and the Federal Agency on Press and Mass Communications.
Bicycle Day is an informal celebration that marks the anniversary of the day when Swiss chemist Albert Hofmann intentionally ingested 250 micrograms of LSD. The first LSD trip occurred on April 19, 1943.
Congenital Diaphragmatic Hernia Action Day is an annual awareness campaign held on April 19. It aims to raise awareness of a birth defect of the diaphragm, which is a life-threatening pathology and a major cause of infant mortality.