From http://www.setdancingnews.net/, some lovely accounts of music making from old dance manuals etc., I like these instructions on ettiquete from old ballroom books:
"Don’t be too energetic: consider your partner.
Don’t smoke while dancing, and don’t leave cigarette ends all over the house. Respect your hostess’s furniture and carpets, and don’t risk setting the house on fire."
Ah, what a problem that is! Come to Mrs. O’Leary’s celidh!
The extracts are from all sorts of old and new books, quite a treasure trove if you’re into this sort of thing.