Crystal's
Good Wanda was there to watch and study and talk to people. Evil Wanda is not, she is also checking out the Good Campus while people are distracted and it would be too obvious that she doesn't care about people if she went.
Good Jo went and will sing. Evil Jo stayed behind on their campus to keep an eye out if anyone is coming over there to explore because she doesn't trust any of them.
Good Tandy is there because she usually is, and Evil Tandy came for the free food. She'll be pretty quiet and despondent and mainly not draw attention to herself.