Here is a good source for details on this:
http://www.sonymusic.com/artists/CRRadioHour/crhhisto.html

I have not found any of this material to have been commercially released.

Christmas with Bruce Cockburn
Bearsville Theatre
Woodstock, NY 1991 Dec 15
1. Lovers In A Dangerous Time
2. Silent Night
3. Dream Like Mine
4. God Rest Ye Merry Gentlemen
5. He Came Upon A Midnight Star*
6. If A Trees Falls
7. Cry Of A Tiny Babe**
8. Waiting For A Miracle*

* w/ Sam Phillips
** w/ Sam Phillips & T-Bone Burnette