Check out history and pick a good one for us.
https://en.wikipedia.org/wiki/April_16
1943 – Albert Hofmann accidentally discovers the hallucinogenic effects of the research drug LSD. He intentionally takes the drug three days later on April 19.
This one is for you silverspiker!
https://en.wikipedia.org/wiki/Albert_Hofmann
Albert Hofmann (11 January 1906 – 29 April 2008)[1][2] was a Swiss scientist known best for being the first person to synthesize, ingest, and learn of the psychedelic effects of lysergic acid diethylamide (LSD). Hofmann was also the first person to isolate, synthesize, and name the principal psychedelic mushroom compounds psilocybin and psilocin.[3] He authored more than 100 scientific articles and numerous books, including LSD: Mein Sorgenkind (LSD: My Problem Child).[2] In 2007, he shared first place with Tim Berners-Lee in a list of the 100 greatest living geniuses, published by The Daily Telegraph newspaper.[4]
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Dream is Collapsing (Hans Zimmer)
1961 – In a nationally broadcast speech, Cuban leader Fidel Castro declares that he is a Marxist–Leninist and that Cuba is going to adopt Communism.
https://mashable.com/2014/12/17/fidel-castro-admirers/
"When Fidel Castro came to New York in April 1959, it was a mere four months since the 33-year-old had led the successful revolution to overthrow the Cuban dictator Fulgencio Batista."
I watched his New York ticker tape parade on TV. He was treated as a liberator, a hero, although he was known to be a communist.