Yes, it was September of '71. I didn't go to school there but my friends brother was dorming there and we went to visit him quite a bit on weekends to party. That was one of the first shows of the semester.
As River stated details are a bit foggy (6hr long show and mescaline), but like Gibi says, I too was mesmerized. I remember the tone was to die for. Duanes slide had me from the first note and I didn't leave my seat in all that time, not wanting to miss out. No idea which guitar he played, but I think he switched out a few times over the course of the night, might have been handing them to a tech for tuning... don't quite recall.
It was a great time to see bands like this in small college gyms, the exception being Zep in arena shows. But yeah, Foghat, Alice Cooper, ABB, Tull, Fleetwood Mac, Uriah Heep, the list is long. My buddies and I even got recorded on Peter Framptons, 'Frampton Comes Alive' recorded at Plattsburgh State University gym, the audience mics where hanging just above us.
Weren't you the one who I had the conversation about Lynyrd Skynyrd opening for Black Sabbath? I know you love music, wished you could have been there.