I have a few - Status Quo, Newcastle City Hall, 1972 (my first concert); Pink Floyd, Stafford, 1977 (Animals tour, performed in a Cow Shed); Rolling Stones, Wembley, 1983 (not a huge fan, but they were brilliant); Dan Fogelberg, Detroit, 1985 (my girlfriend - now Mrs. FF - made me go, and I was blown away by how good he was).
Quo at the De Mont '73 ish, out standing and very loud ! (never a let down the original four)
For me though, The Faces at the Edmonton Sundown 3/6/73 was the best. Ronnie Lanes last performance with the band . Saw them again 2 months later at the Reading festival with Tetsu on Bass
This is tough, but off the top of my head.
The Jam....Wembley Arena Dec' 1982( 2 & 5 nights)
Grace Jones..Royal Festival Hall
Cassandra Wilson....Jazz Café
Erykah Badu ....Jazz Cafe....1997?
Primal Scream ...Brixton Academy all nighter.,dunno 1995 at a guess