Here is some information from the page on Artsy for the ACLU auction:
Street Art for ACLU: Benefit Auction 2017
Bidding closes Apr 30 7:00 PM EDT
ACLU of Southern California + Artsy present Street Art for ACLU: Benefit Auction 2017, featuring Shepard Fairey, Colette Miller, Knowledge Bennett, and more.
For nearly 100 years, the ACLU (American Civil Liberties Union) has been our nation’s guardian of liberty, working in a multitude of ways to preserve the individual rights and liberties that our system of governance was established to provide. In the current political climate, the importance of the ACLU’s efforts is manifold. Art, specifically street art, has long functioned as a political tool—even impacting international politics in profound ways.
We have gathered over forty significant contemporary artists—the large majority of them street artists—to raise awareness for the ACLU and generate support for the organization’s invaluable efforts.
Bidding will be open exclusively on Artsy and will close at 4:00pm PST on April 30th, 2017 (7:00pm ET).
Here is the link to the auction.