This is the rock n roll set w/ members of the JA. I am going to say this is the first set of the night, followed by NRPS then GD. Fenton (2006, 158) refers to this as Hot Tuna w/ Garcia guesting, but we'll just refer to it as an ad hoc configuration.
from deadlists.net entry for this night "Grateful Dead with members of Jefferson Airplane (definitely Jorma, Jack, and Joey Covington, who handles some vocals)"