I have to agree with you about Rory Gallagher. Saw him a few times, but the time frame you're talking about I saw him at a small venue (Whiskey or the Roxy) and it was so intense I felt priveleged to be one of the relatively few who appreciated his talent. I had a smile on my face the whole time, I remember that much (and I don't think it was due to any hardcore substances).
I'd been to some bigger concerts, the Stones as I mentioned elsewhere and Alice Cooper at the Hollywood Bowl (which was a spectacal), and a bunch of artists I liked at the Santa Monica Civic (like the Kinks, Lou Reed, Mott) but when stadium concerts became popular, I just wasn't interested. I can only be around so many other dumbfucks at the same time.
Funny you should mention Lou Reed. I didn't get to see him that early in his career, but those two live albums with Hunter and Wagner on guitar are among my favorite live albums. I heard they dubbed over them (a la Kiss Alive), did they sound so good when you were there? (like you'd remember:)