When the Dead made their Deer Creek debut in 1989, the 21,000-capacity venue was already a throwback to an earlier era in the Dead’s summer touring, deep in the literal and proverbial cornfields, before “Touch Of Grey” blew them into stadiums. It’s an instant legend. “Truckin’” points the band into the night’s jam sequence, symbolically adding Noblesville to the list of stops on the song’s Möbius strip tour itinerary. Tonight Weir steers the song down the blues exit via Howlin’ Wolf’s “Smokestack Lightning,” a Ron “Pigpen” McKernan favorite in the old world, revived by Weir as an ominous hair-raising standard in the ’80s.