Not sure exactly what a gender-swap workshop is-- are you sure that's a topic for a dance e-mail list? ;-)
I've had fun at a workshop with skilled dancers teaching a reasonably normal dance (e.g., not one with a lot of idiosyncratic moves), running it half a dozen times so everyone learned the sequence, stopping the music, telling folks to change sides and dance the opposite gender role, not giving them time to think much about it, and then starting up the music again. In the middle of some brain-busting dances, it was a pleasant and fun change of pace. David Millstone
