This is a party piece of mine, too.

If you know the Upton on Severn stick dance tunem try it in Gm in waltz time - definitely Upton on Volga!

I play Winster Gallop in major with flattened seventh (mixolydian?) in Cajun style. I shall try Rigs ditto.

William and Nancy (Bledington) makes a lovely French accordion waltz, major or minor.

Sad minor morris tunes? Nobody mentioned Shepherd's Hey Fieldtown a.k.a. Signposts. Very sad, wanders inot and out of the minor.