Yes they premiered 'The Who's Next' at The Assembly Hall in 1971. I was there. My friend and I sneaked in, although we had tickets. We watched Keith Moon rehearsing before we got chucked out. Believe me, he didn't need to practice !
Colosseum / Juicy Lucy. Brighton Dome January 1970. My ears are still ringing from Glenn Fernando Campbell's steel guitar. I don't think I've ever heard anything quite like it since.