I'd be willing to bet a buck, that Levon records all these happenings.  He just doesnt publish them, at least not yet. There is a "Meryl Fest Ramble"  out on CD and PBS did a "Levon Helm-Ramble at the Ryman" so the creation of media to document these once-in-a-lifetime experiences is a given. We may or may not ever see or hear any of this, but we can always hope. And even if it never comes to pass, I can always come back here and re-read the writeups from Van and Doug to try a grasp the feelings they had and hope I someday get to experience something similar.