- Hey Day began as "Moving-Up Day" in 1916. It is the day when juniors are proclaimed to be seniors. Slated for April 20th this year, hundreds of Penn juniors plan to continue the tradition of sporting red T-shirts, canes and plastic foam hats as they picnic and then walk to College Hall for the declaration.
- 1995 Oklahoma City Bombing
- 1999 Columbine High School Massacre
- 1689 : Siege of Londonderry begins
- 1871 : Ku Klux Act passed by Congress
- 1902 : Curies isolate radium
- 1777: New York adopts state constitution
- 1931 : First woman appointed to auto board
- 1861 : Lee resigns from U.S. Army
- 1978 : Korean Air Lines jet forced down over Soviet Union
- 1906 : San Francisco firefighters halt massive blaze
- 1896 : First Vitascope show (flim slide)
- 1841 : First detective story is published
- 1898 : McKinley asks for declaration of war with Spain
- 1970 : Nixon announces more troop withdrawals
- 1945 : Operation Corncob is launched while Hitler celebrates his birthday
- National Marijuana Day
Famous Birthday Days:
- Luther Vandross (Aladin " I can show you the world."
- Carmen Electra (yes the hot one)
- Maricus Aurelius ( the old guy in gladiator)
- Adolf Hitlar (that SOB you all know)
- Napolean Bonaparte III (he is french)
- Benny Hill (died)
The Crew-Mobil

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