I like Hobbes' Ovens Auditorium speculation. It's a show that's almost completely off the radar historically. From Brucebase:
1976-03-29 - OVENS AUDITORIUM, CHARLOTTE, NC
IT'S MY LIFE / THUNDER ROAD / BORN TO RUN / 4TH OF JULY, ASBURY PARK (SANDY) / DETROIT MEDLEY
Incomplete setlist.
The listed tracks are mentioned as having been performed in a review the following day in the Charlotte Observer. This was a last-minute addition to the tour itinerary, arranged on only five days notice by a local promoter who became aware Springsteen had an open date available following the Duke University gig. Despite the lack of pre-event promotion Bruce pulled in an enthusiastic, near-sellout crowd of 2,400.