I'm guessing that, if Henley is hitting his 70th birthday this year, Joe will be too. (Nov 20th). If, like Henley, there's a birthday, concert celebration, it could be quite an event! The James Gang, Barnstorm and Eagles all on the same stage, without even mentioning all the superstars he's pals with, and has worked with, since the late 60s.
It's likely that they'll be busy working elsewhere but I can reel off 10 to begin with:
1. Ringo Starr
2 Bill Szymczyk
2. Waddy Wachtel
3. Jeff Lynne
4. Jay Ferguson
5. George Perry
6. Steve Winwood
7. JD Souther
8. Richard Marx
9. Michael Stanley
10. Taylor Hawkins
plus some mighty guitar heroes and several stars he's shared posters and stages with. He's going to bump into Stevie Nicks at the Henley show. She's written songs about Joe.