Formed by Allman Brothers Band guitarist Warren Haynes in 1995, Southern rockers Gov’t Mule are celebrating 20 years of jamming out with a special summer tour that draws from their extensive catalogue of music for one-of-a-kind shows. While prepping for a new album, the band recently released The Tel-Star Sessions, archival recordings from their first years in the studio, and fans of the Mule will be able to hear songs from their entire repertoire when they perform with special guests Blackberry Smoke on Wednesday Aug. 31, at SOMO Village, 1100 Valley House Drive, Rohnert Park. 6:30pm. $45–$50. somoconcerts.com.