Here are newspaper ads from The Lexington Herald - 1949 to 1951...
These ads are not ALL that help to document the KENTUCKY MOUNTAIN BARN DANCE.
A few more ads, along with a discussion of the show's run, its move from the Clay-Gentry Arena to
the Woodland Auditorium, and more are viewable at:
https://hillbilly-music.com/programs/story/index.php?prog=965
The last show advertised with the full name "Kentucky Mountain Barn Dance" appears to have been on May 5, 1951.
But a newspaper ad on November 9, 1951 promotes the "Barn Dance" at Woodland Auditorium that included the "Sauceman Bros. (Carl and J.P)" and "Curly Sechler" and "Larry Richardson!"