Hi Tony,
When I was was playing in clubs in the 70's, the barndance (or "horror stretch" as we used to call it) was a Saturday night staple. The sort of songs we played were generally old time tunes over 32 bars played segueway. Some examples:
Carolina In The Morning
Lily of Laguna
Walkin' My Baby Back home
Side By Side
When I'm 64
Red Red Robin
Over this side of the Black Stump the barn dance was more of a swing than a march, played around 120 bpm.
Hope this helps a bit; good luck with the gig.

Cheers,
Keith