I believe that today is the 80th anniversary of the opening of Show Boat on Broadway!
Hmm... I just checked the IBDB, and they
don't list
Show Boat opening 80 years ago. However, when you bring up the show listing, it does say it opened on December 27, 1927.

*There is a notation that the entry has not been verified, and I'm also wondering since the show did not have any previews...
However, other shows that opened on this date...
The School for Scandal, 1909
All in Fun, 1940
Clash by Night, 1941
Angna Enters, 1942
Home of the Brave, 1945
Temper the Wind, 1946
Topaze, 1947
The Madwoman of Chaillot, 1948
How Long Till Summer, 1949
The Persecution and Assassination of Marat as Performed by the Inmates of the Asylum of Charenton Under the Direction of the Marquis de Sade, 1965
At the Drop of Another Hat, 1966
Purlie, 1972