One week after Judy Hopps and Nick Wilde become partners in the Zootopia Police Department (ZPD),[c] their clashing personalities start to complicate their work, and Chief Bogo threatens to separate them unless they resolve their differences. During a raid on a smuggling ring, Judy finds a piece of snake skin, although snakes have not been seen in Zootopia for years. Undeterred, she discovers that a snake may be at the Zootennial Gala, an event hosted by Milton Lynxley, whose grandfather Ebenezer founded Zootopia, to celebrate its centennial anniversary.