I wish those of us who are English would give ceilidh back to the Celts and stop being ashamed of English Country Dance.

Sarah, as I have said elsewhere, "ceildhs" tend to work better as "ceilidhs" and "concerts" tend to work better as "concerts". If you have a "ceilidh" band that is also able to double as a "concert" band, and that would probably mean at least playing tunes not intended for dancing and at best some members of the band being able to sing well, then you might have a better chance. Would you expect the audience/dancesr to stand during the "concert" spots? Do you have a place for hard core dancers/no dnacers to escape to? Will you risk dancers/non dancers either arriving late or leaving early when "their" preference is over? Will you need to duplicate on PA systems or will they share, will there be a smooth transition between spots both artistically and logistically?

Anyway, good luck with what you are doing and I'm ready to pop up the road to get the custard for my humble pie!