A dance of course is a different sort of experience than a concert--for us, the States, it is much regretted that there is no longer a custom of dancing.I would suggest that you begin by having singers perform a few songs with the dance band--the people interested only in dance will not leave and you will offer something for people who enjoy the singing for its own sake--
Then, you may begin to plan small get-togethers with the people who like songs--the key to this is that you have to find your audience and build it up, a little bit at a time-
You cannot expect that, because there is a large audience for dance, that you can automatically expect them to sit down and listen to folksinging--but, if there is an audience for dancing, it is quite likely that, with a little work and little time, you can build up an audience for singing and other music, as well--