Speaking personally, I had intended to go, but forgot. If I'd had a personal invite, I wouldn't have forgotten, because I would have marked it differently. But that's just one data point.

Sounds like you got a great turnout, really! Were these mostly the same folks that have been coming once every few weeks, or did it drag in new dancers too? I grow a bit nostalgic for the days when carloads of Wellesley or Brandeis students would show up 30 minutes late...