RatDog guitarist Mark Karan will sit in with Donna Jean Godchaux Band twice this month. Karan—who has also performed with The Others Ones and Phil Lesh & Friends—will join Donna Jean Godchaux Band at Laurelton, PA’s A Bear’s Picnic on August 14 as well as Stephentown, NY’s Bella Terra Festival on August 19. He will fill in for Godchaux’s regular guitarist Jeff Mattson, who is on the road with Dark Star Orchestra. Godchaux recently played a few shows with another Grateful Dead family band, New Riders of the Purple Sage.