I find it difficult to imagine attending a dance with hundreds of people
without making some arrangement to ensure I have partner for plenty of
dances. The bigger then hall and the more numerous the dancers, the longer
it will take to find a partner in the few minutes available between one
dance and the next.
You can only dance with so many people in an evening (20 dances = 20
partners at most), which means that you won't even get to wink at the
majority of attendees.
Beyond 50-60, a ball can ge very impersonal. You can't even see who is
dancing or what is going on in other sets, let alone enjoy the comments and
exchanges that can take place in a smaller gathering.
Another thing: which is more flattering, to be invited to dance ahead of
time? or to be grabbed at the last moment because the grabber could not find