WAV, it has been explained several times in this discussion what happens at English ceilidhs, but as you appear to be convinced that they are somehow damaging to English culture I am curious to know what your own perception is. By your refusal to attend ceilidhs it appears that you don't just object to the word but to the activity as well. If you were serious about preserving and promoting English culture you would be celebrating this, not nit-picking over the use of a word borrowed into the English language.

To repeat it yet again, ceilidhs are events where you will find English Country Dances done. You can also expect dances of foreign origin, such as waltzes, polkas, mazurkas, schottisches and quadrilles, which have been long enough established in England to be considered English dances (by everyone except you, apparently). And as it is a living and thriving (albeit minority) tradition, it continues to invent new dances and borrow others from elsewhere.

If you want to find English Country Dances, go to a ceilidh.