Not that I know of, though that doesn't mean it's not out there. Heck, some other Cast Members told me about this They're sure not doing a good job of getting the information out about these things... what does Cast activities get paid for?
I heard auditions for cast choir aren't totally "auditions". I think you sing the scale to see where you are to be placed. I think any kind of auditioning happens when they pick the choir for the tree. I could be wrong but this is what I remember hearing.
In other news, if I don't work... I MAY BE THERE! Who wants to go together?
"I'm not funny. What I am is brave." - Lucille Ball