On programme planning.
I don't see how you can blame the composer for wasting your time - it's the callers responsibility to know what is wanted.

Personally when I call at a Social dance club with live music (we usually dance to recordings) I like to find out what the musicians already enjoy playing and use a fair proportion of those tunes. Obviously this wouldn't work in a higher powered setting.

Do your 5 callers call for every dance? It must be hard to build up a balanced evening. The clubs I call at have a rota, with a caller responsible for a whole evening or half. New callers are slotted in with 1 or 2 dances. I've noticed that new callers are eager to try out the new, clever, dances they've enjoyed dancing. More experienced callers call according to the club members abilities. But if you only get a few dances each evening you may not want to repeat a 'chestnut'

I went to 2 dances a week apart with the same band. Both were clubs' Christmas Dances. One included some familiar dances that could be played to 'any jig or reel' as well as some dances with set tunes and some newer dances. Both the band and dancers had breathers to relax and play or dance well. The band was excellent.
The next was all dances and tunes I didn't know. And it sounded as if the band were sight-reading. Didn't sound like the same band. For me the joy was less.