Yet another benefit gig at the 2018 (Beck's fifth in two months), this one was to raise funds to fight California's wildfires, a recent one having ravaged Malibu where Beck used to live. This gig was headlined by Father John Misty, and Beck was an "unannounced guest." The lineup had Weyes Blood, Tim Heidecker, Rostam, Lucius, Jonathan Wilson, Jeff Bhasker, Nate Ruess, Beck, Haim, Rivers Cuomo, Jenny Lewis, Mac DeMarco, and Father John Misty. Most had short 10-15 minutes sets, including Beck.
Beck from what I understand played "Everybody's Gotta Learn Sometimes" by himself, and also a "Where It's At" that included Father John Misty on drums, Este Haim on bass, Jonathan Wilson on guitar, Jeff Bhasker on keys, and Roger Joseph Manning Jr. on piano. (Those are the two songs I've read about now; might be one or two others.)
[people and bands
Bass: Este Haim
Drums: Josh Tillman
Guitar (Acoustic): Beck Hansen
Guitar (Electric): Jonathan Wilson
keyboards: Jeff Bhasker
Other Band: Father John Misty, Haim, Jeff Bhasker, Jenny Lewis, Jonathan Wilson, Lucius, Mac DeMarco, Nate Ruess, Rivers Cuomo, Rostam, Tim Heidecker, Weyes Blood
Piano: Roger Joseph Manning Jr.
Vocals: Beck Hansen