1. Is there an archived discussion on this topic that any one knows about, and if so could someone point me to it?

2. If not, I'm wondering about other callers' experiences with these dances - how "challenging" is generally appropriate? (Bear in mind this is not Greenfield, Concord, or a similar dance series where it's safe to assume most dancers will be very experienced/skilled). What sort of "arc" has worked well for such sessions? I know the final program will be determined by the level of those who actually show up to the dance, but it'd be nice to start with a general frame of reference.  

3. Any favorite challenging dances anyone has been having particular fun with lately? (I have a good assortment but am always looking for new ones).