October 11th 1975 - "Saturday Night Live" was broadcast for the first time. George Carlin was the guest host

http://img2.timeinc.net/ew/dynamic/imgs/071112/snlcast_l.jpg

happy 35th snl thanks for all the laughs saturday just wouldnt be saturday without you

Useless trivia:
*George Carlin didn't participate in any skits, which is now common practice for a host to do on SNL. Instead, he periodically popped up on stage to do excerpts from his stand-up act (e.g. the famous "Baseball vs. Football" routine).

*It was called on screen NBC's Saturday Night at first. This was because at the same time, ABC had its own variety show called Saturday Night Live which was hosted by Howard Cosell.