I don't have any experience of this, however, I think the idea of having 2 rooms is appealing because there's more chance of music for everybody being covered. Maybe start it once a month rather than fortnightly because it will make it more special and maybe dancers will be more inclined to make the effort for once a month in the middle of the week rather than fortnightly.
Mind you, once its up and running, you could survey the dancers to see if it would be viable to go for fortnightly...
Good luck with it
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