“Twenty Years So Far” read the tickets for the Dead’s November ’85 shows at their newly refurbished and renamed Bay Area home at the Henry J. Kaiser Convention Center on the banks of Lake Merritt in Oakland, almost precisely the anniversary of when Jerry Garcia plucked the name “Grateful Dead” from a dictionary. Musically, the Dead didn’t generally do intentional anniversary throwbacks, but the middle night at the Kaiser opened (and closed) with a cover straight from the Warlocks’ repertoire: Don and Dewey’s “Big Boy Pete,” played with the garage gusto of a local band made good, its first appearance at a proper Dead show in 15 years and last ever.