Just earn 24 Gold Stars dancing through 7 songs in this category. You can dance to the same song over and over again and accumulate stars that way. I found that the songs ‘Anything to Help My Friends’ or ‘La Bamba’ in Dance mode weren’t that difficult.
It is recommended that you use the chair method to unlock these as the Fancy Footwork songs are longer and have more complicated dance moves. You are guaranteed at least one Gold Star but I was earning two Gold Stars about half the time. Results may vary.