Nancy has done her Cabaret act at conventions before. She sings a variety of pop and showtunes, and yes, its likely she will do "I wanna dance for you." Some others songs she has done include "Girls just wanna have fun" and "I'm tired" from "Blazing Saddles." She has a good time and it usually goes over very well. She does little spoken bits between the songs. I recommend going to that part of the convention
Michael