At Lichfield, which is mainly a Dance festival they have music workshops, where the musicians prepare to play for a dance later in the weekend.
We went last year and practised tunes for dances from Jane Austin's time. Since we have danced most of the dances the tunes were in people's head even if they hadn't played them before, and a lot of those at the workshop already play in dance bands. When it came to the dance we let the experts play, and we danced. Actually they are doing it again this year. Music workshop to prepare for 2 dances, one of which is open mike for callers (probably club callers wanting to call at a festival, rather than complete beginners)