This Saturday, July 1st, during Dead & Company‘s tour closer at Chicago’s iconic Wrigley Field, a pair of special one-of-a-kind D’Angelico guitars will be auctioned off to benefit a variety of charitable foundations hand-selected by members of the band. The auctions are part of the “Participation Row” social action “village” the band brings to each tour stop, co-organized by music-oriented voter registration non-profit HeadCount and environmental group REVERB. Both guitars are Premier Weir SS models, which Bob Weir and D’Angelico designed and developed together, and each one is signed by all six members of Dead & Company (Weir, Mickey HartBill KreutzmannJohn MayerOteil Burbridge, and Jeff Chimenti). They are expected to net tens of thousands (or even hundreds of thousands) of dollars for charity.

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The first guitar being auctioned off may look familiar to those who have caught the band live this summer: it has been displayed (and available to bid on) at Participation Row at each stop throughout the 2017 summer tour, and already has received bids of nearly $50K. The second guitar will feature a special design to specifically commemorate the Wrigley Field run. Bids will be accepted at “Participation Row” at Wrigley Field throughout Friday night’s show and through the first set of Saturday’s tour finale. The winners will be determined at set break on Saturday night. You can see pictures of both the Summer Tour 2017 D’Angelico Premier Weir SS and its Wriglet Field counterpart in all their glory below:

On this summer’s Dead & Company tour, three D’Angelico guitar auctions (of Fenway ParkShoreline Amphitheatre, and Folsom Field variations of the special edition design) have already generated $70,000 for the band’s various charities, which include HeadCount and REVERB as well as The Rex Foundation, The Jerry Garcia Foundation, The National Parks Conservation Association, Positive Legacy, the Hawai’i Alliance for Progressive Action and the Veterans Health and Integration Program. Nightly signed poster auctions this tour have also generated an additional $25,000 toward the various charities involved in the “Participation Row” efforts. By the time the band takes the stage for the last time this summer, the total charitable contribution could easily surpass $250,000.

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HeadCount has ran several similar charitable guitar auctions for various events over the past few years. At 2015’s Fare Thee Well shows in Chicago, a D’Angelico guitar signed by members of the Grateful Dead was auctioned off for an eye-popping $526,000. Similar efforts on last summer’s Dead & Co tour netted over $160,000 in contributions. HeadCount also helped produce an event last month where Jerry Garcia’s “Wolf” guitar was sold for $1.6 million, generating a total of $3.2 million for the Southern Poverty Law Center after an anonymous donor match.

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“Dead & Company and their fans are incredibly generous,” said HeadCount executive director Andy Bernstein. “They’ve helped turn Participation Row into an active and loving home for all the various causes tied to this community.” Dead & Company concert attendees have also taken nearly 20,000 socially-conscious actions on “Participation Row” throughout the tour, including writing postcards to Congress, registering to vote, and taking quizzes about environmental impact. Any fan who takes three actions is rewarded with a limited edition Dead & Company pin from Participation Row sponsor Clean Energy Advisors. Fans also get a chance to win one more D’Angelico guitar signed by the band in a free drawing.