One of the dullest gigs I saw was santana at Earl's court (76). Eric Burdon, supporting, was good though. I saw McL at Reading in 75. The original Mahavishnu Orchestra but with Jean Luc Ponty in place of Jerry Goodman (I think)....TBH a long way from anything I listen to today....
I listened to Birds of Fire the other day on vinyl, still sounds good.
I also went to Reading in 75. Did your tent get washed out in the rain ?