 In 2010, he performed with Bob Weir at the benefit for Rainforest Action Network.In 2012, Simon performed at the Jerry Garcia 70th birthday tribute along with Bob Weir, Cass McCombs, and members of Vampire Weekend.He shared the bill with the Grateful Dead's Phil Lesh at a benefit for Rainforest Action Network in 2013, and performed along with Weir, Lesh and others at the memorial for Grateful Dead lyricist John Barlow at the Fillmore Auditorium in 2018.