Recent Relix cover subjects and onetime Jambands.com New Groove of the Month The Avett Brothers will host their own festival this summer. AvettFest will take place at Somerset, WI’s Somerset Amphitheater on June 29. In addition to the Avetts, the festival will feature Brandi Carlile, Dr. Dog, and Wheeler Brothers. The Avetts will perform in Oslo, Norway this evening.