My get in for free story was 1-17-79. That was a reschedule from a show cancelled at the New Haven Coliseum due to Jerry's bronchitis. Back then.....they used to rip your ticket. They did a radio broadcast the night before and actual allowed everyone in thinking the show was going to go off. According to my sister, who was there (I wasn't), about 30 min after scheduled start time, Weir came out and announced Jerry was too sick to play.
When they came back in January, I used a ticket stub from the show they had done there in May 78. In like flynn.
First Show - 5/5/77
Last Show - 3/28/93