I was a big fan in the pre-Aqualung days (Benefit, Stand Up, This Was)
I saw them in Phoenix, AZ in the Phoenix College Gym (sometime in the late 60s). There were ~200 people in the audience all sitting on the floor. I was a couple of feet from the stage.
I saw them again in Vancouver, BC a year or so later. The concert was, for me anyway, disrupted by people setting off firecrackers. The following morning, Clive Bunker was sitting at the restaurant table next to me for breakfast. We had a brief conversation.
Last time was also in Phoenix in some auditorium and it was a good concert, but seemed to lack some of the energy of the earlier shows.
However, the best Tull-like concert I've seen (and one of the best I've attended) was Blodwyn Pig (led by former Tull band member, Mick Abrahams) at "The Splinter Brothers and Sisters Warehouse" in Phoenix. It was a supreme counter-culture experience in every way. Their albums are worth your attention.

