I'm thinking some manufactured mist or fog or smoke would probably work better. The less people can see, the more "shy" people will get up and dance....
I think the Mardi Gras beads only work because there's usually some alcohol in the area at about the same time. :-)
I have to admit that when I used to drink I also used to dance. Fortunately this was before cell phone cameras and video cameras were as common as pennies.... so I can deny everything.