Honestly, Disney performers are a bit higher class than on cheaper cruise lines. I'm sure "chores" are within the entertainment field. I'll ask the cast member that I know but I really think the job categories are very carefully designed. If you serve meals, you do that morning noon and night. There is plenty of entertainment all the time and plenty of jobs for them to do. I might wonder how much stage work they do, like moving sets, but I really honestly doubt Disney would treat these fine performers as you suggest. Disney does lots of character appearances though, and I'm sure performers must do that. And I just remembered that I did see someone who had appeared on stage helping with Minnie Mouse. You never see Minnie Mouse or Mickey Mouse without someone who is helping. I imagine all the characters who cannot speak need helpers. It still falls in the entertainment category though. And I think almost everyone who works for Disney realizes they are a "cast member." For instance, when we were buying some lithographs in one of the shops on board there was one that was missing from the set. The cast member said, "Let me look backstage."