A Party For Mother Earth

It's actually much, much prettier than it looks in this picture.

New Riders headlining "A Party for Mother Earth", benefiting the Bear Commune, Friends and Relations Hall, 660 Great Highway, June 3, 1971.

Jerry Garcia and Friends, Sanpaku at the Matrix: May 20-21, 1969

Fascinating.

I told you all that the Examiner would yield many interesting things. Well, this is one of the most interesting. Sometimes skimming cream is worth the price of later anticlimax.

Jerry Garcia and Friends and Sam Paku [sic: Sanpaku] at the Matrix, Tuesday, May 20 and Wednesday, May 21, 1969.

Garcia's first understood public pedal steel playing happened 5/14/69 at the Underground, supposedly a Hofbrau house in Menlo Park, understood just to be him and Marmaduke. The second instance was the second day of this listing, 5/21/69.

So, do we imagine this is Jerry and his pedal steel, and maybe Marmaduke and his songs?

If not, then what?