From Wikipedia:- Velvet Revolution - In the face of protests, the Communist Party of Czechoslovakia announces they will give up their monopoly on political power.
Nov 9 1989 was a Thursday.
Nov 28 1977 was a Monday.
Nov 28 1950 fell on a Tuesday.
The U.S. spacecraft Mariner 4 launched-on its way to the first successful mission to Mars.
Friday
Wednesday
It was a Friday.
Nov 1989.
November 23rd, 1989 fell on a Thursday.
nothing...
Kennedy assasination
Nov 18th, 1989 I believe.