The Halloween fiasco started when Mayor Coss thought it would be fun for the gems to participate in Halloween, and thought that their fusions would be fun costumes, not exactly understanding how they worked and existed. Goldstone came out, and someone challenged her at the Halloween Fair to complete all the games there, as well as hit every house on Halloween.
She was not seen for three days.
Fusions are no longer allowed at any of the town fairs and festivals.