" but some qualification is needed if you don't want half the PTA to turn up in check shirts and cowboy hats, going 'Yee Ha' for no apparent reason every few minutes. "

I played my first Ceilidh, advertised as a Barn Dance a few months ago at the local Primary School, there was a ploughmans supper and all of the PTA were wearing check shirts and cowboy hats, and indeed 'YEE HA' was heard on occasion. Ouch.