For Traditionalists, you don't fulfill the mandatory Sunday mass attendance by going on Saturday. You have to go on Sunday if you have an avaliable mass. Novus Ordo or Indult mass are not to be considered obviously.
Plus, a craft show might be an unnecessary buying and selling occasion on Sunday, and thus a sin against the prohibition to work or make others work on Sunday. I advise you to consult a wise Traditionalist priest about attendance on this event on Sunday.