This weekend at Dead & Company’s two-night finale at Wrigley Field in Chicago, a pair of D’Angelico guitars will be auctioned off to generate thousands of dollars for charities chosen by the band.

The first guitar has been on display at the Participation Row social action village at each stop on the tour and the second will be made specially for the band’s Wrigley Field summer sendoff, with each signed by Grateful Dead members Mickey Hart, Bill Kreutzmann, Bob Weir, John Mayer, Oteil Burbridge and Jeff Chimenti.

In total, more than a dozen organizations will receive a share of the proceeds from the guitars including The Rex Foundation, The Jerry Garcia Foundation, The National Parks Conservation Association and many more.