NASHVILLE (AP) - An improving Willie Nelson will make his festival date this Saturday in Nashville after all, and he's bringing a friend.

A news release from festival organizers said Nelson has recuperated enough from a shoulder injury that he's able to keep his evening slot at the Zac Brown Band's Southern Ground Music & Food Festival. Warren Haynes will sit in with Nelson and his band for a handful of songs as well.

Festival organizers also announced Kenny Rogers will be joining Brown and his band during its star-packed Friday headlining set that also includes Kenny Chesney and Jason Mraz.

Nelson pulled out of the festival and postponed three other dates earlier this week after doctor's advised him to rest his shoulder for a week. The missed dates in Michigan, Indiana and Illinois are being rescheduled.