Looking around Wikipedia (the real one), I came across the date service - it tells you things that have happened on that date throughout the ages. So I thought...

What significant action/person/thing shares your birthday?

Just enter your birthdate (Month_Date Number) into the above link.
Here is a selection from my birthday, November 20^th


Historical Things:
1789 - New Jersey becomes the first U.S. state to ratify the Bill of Rights.
1820 - An 80-ton sperm whale attacks the Essex (a whaling ship from Nantucket, Massachusetts) 2,000 miles from the western coast of South America (Herman Melville's 1851 novel Moby-Dick was in part inspired by this story). (My favourite...)
1917 - Ukraine is declared a republic.
1947 - The Princess Elizabeth marries Lieutenant Philip Mountbatten at Westminster Abbey in London. (40 years before I was born)
1955 - RCA offers a $35,000 contract for Elvis Presley.
1962 - Cuban Missile Crisis ends: In response to the Soviet Union's agreeing to remove its missiles from Cuba, U.S. President John F. Kennedy ends the quarantine of the Caribbean nation.
1998 - The first module of the International Space Station, Zarya, was launched
2003 - Michael Jackson is arrested by police on charges of child molestation...

Births:
1620 - Peregrine White, first English child born in the Massachusetts Bay Colony (d. 1704)
1841 - Wilfrid Laurier, seventh Prime Minister of Canada (d. 1919)
1889 - Edwin Hubble, American astronomer. Discoverer of the wide prevelance of the Red Shift in astronomy, at Mt. Wilson Observatory in California, and for whom the Hubble Space Telescope is named (d. 1953)
1914 - Emilio Pucci, Italian fashion designer (d. 1992)
1925 - Robert F. Kennedy, U.S. Attorney General, Senator from New York State, and brother of President John F. Kennedy (d. 1968)
1956 - Bo Derek, American actress
1965 - Mike D, American musician (Beastie Boys)

Deaths:
1910 (N.S.) - Leo Tolstoy, Russian novelist (b. 1828)
1975 - Francisco Franco, Dictator of Spain (b. 1892)

Holidays:
Church of England - Edmund the Martyr
Brazil - Zumbi Day (Since 1978)
United Kingdom - wedding day of Queen Elizabeth II (1947), official flag day
Mexico - Anniversary of the Revolution (1910)
UNICEF - Universal Children's Day
Vietnam - Teacher's Day (Ngày nhà giáo Việt Nam)
Transgender Day of Remembrance (since 1999)