The very first episode of SNL will receive a special broadcast, Saturday, February 15
Saturday Night Live — then titled NBC’s Saturday Night — originally premiered on October 11, 1975. Legendary comedian George Carlin was the episode's Host, and the Musical Guests were Billy Preston and Janis Ian.
The following night, Sunday, February 16, will be the live three-hour primetime event, SNL50: The Anniversary Special.
There was also a 4 part docu-series released back in January:
SNL50: Beyond Saturday Night