Joseph,
Everyone's given you great advice.
If I were doing this I would use music that they're more used to for the first evening. And I'd use dances that they can more easily relate to (see below). That might make for a easier transition and more acceptance (and therefore more enjoyment).
I don't know about now but at one time there was a western contra dance movement. I'm sure the dances they used would be perfect for your group. One source for material is a book on contras put out by Sets in Order. You want my copy? And Don Armstrong put out a collection of dances. Sorry I don't recall the name of the book. I think a good number of the dances in both collections have no or little swinging and also include many of the moves they are familiar with like flutterwheel etc. Maybe google western contra.
As far as I can tell the music they use(d) is recorded but phrased farily well.
Tom
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