Cincinnati Kid said:
The finals of the annual Miss America contest from Atlantic City on Saturday night in September, It was carried on ABC, CBS and NBC in the 50's, 60's and 70's and drew a large number of viewers.
Miss America was never on CBS.
But the Miss (Teen) USA/Universe pageants were on CBS for dozens of years until they were moved to NBC in 2003; back in the day, they were hosted by Bob Barker and later Dick Clark.
As for Saturday morning TV? I pretty much knew the beginning of the end would come with "adult" alternatives like local news and the cooking shows on PBS to go along with the E/I requirements.