@kqvkq9 - I moved to San Francisco in 1973 and I've been here ever since; I was in the retail and wholesale record business from '74 - '84 so I got to see a lot of shows for free.
The New Riders weren't really any wing of the Grateful Dead; just good friends; they were a totally separate band except that they sometimes toured with the Dead, Jerry played pedal steel on their first album and when I saw them back in '70 or '71 opening for the Dead, Jerry played pedal steel with them there, too. After that, Buddy Cage joined, one of the best pedal steel players ever...
On the other hand, Jerry Garcia Band and Kingfish were certainly wings of the Dead!
I wasn't here yet in March of '73 but I wouldn't have gone to that in Berkeley anyway; I'm not much into roots/Americana; the Grateful Dead is about as close as I venture there!