It was just on!
I just saw the appearance. Not bad at all.
Here's who they had: Big Bird, Elmo, Rosita, Abby, Cookie Monster and Oscar. (Zoe was on a photo ad, but didn't appear onstage).
I don't want to spoil it for anyone who hasn't seen it yet, but I do want to say two things: first up, Caroll Spinney rocks. Second, when you do see the appearance, watch Oscar's reactions to everyone singing.
BTW, I'm pretty sure it was Eric as Cookie, but I'll have to check again to make sure.
If you missed it, check your local listings. My local PBS station is doing an encore presentation of it a little later tonight. Yours might do the same.
Convincing John