Sound Summit 2017 will celebrate the 50th anniversary of the Magic Mountain Festival (America’s first rock festival) as well as the Summer of Love with an edition topped by two members of the Grateful Dead.

Phil Lesh & Friends will welcome Bob Weir to the fold as they team up for a collaborative set. Additional performers include My Morning Jacket’s Jim James, Jenny Lewis, Preservation Hall Jazz Band and Vetiver.

Once again, Sound Summit will serve as a fundraiser for Mount Tamalpais State Park by Roots & Branches Conservancy. The festival has raised $100,000 for Mount Tam in its first two years with previous lineups that included the likes of Wilco, Tedeschi Trucks Band, Dr. John, The Mother Hips and more.

Sound Summit is slated for September 9 in Mill Valley, CA and tickets are available here.