Several posts on Twitter tell us that Don joined Jackson Browne last night at the Cherokee Creek Music Festival in Mason County, Texas. No details as of yet, but we'll keep our eyes out. Let us know if you see something.
ETA: Thanks LSB for a few details....Don, Jackson and Mark Cohn joined Shawn Colvin for "Wild Horses" and Jackson invited Don to sing "Take it Easy" with him. Tom in Boston has a few photos on Flickr too.