I don't think of myself as a deadhead anymore, but I put in my time in a vw camper selling soda in parking lots to pay for gas food and tickets.
There's a lot of good audience recordings, and the betty kantor audience/soundboard matrix recordings floating around out there. Plus starting around 86, The Oade brothers started bringing schoeps mics, their great preamp, and various early digital recordings to shows and capturing spectacular recordings.