I'll have a go (in the order that I think of them):
Mott The Hoople - Plymouth Guildhall (3 times, 1971/72)
Black Sabbath/System of a Down - NEC Birmingham (2006*)
The Sensational Alex Harvey Band - Colston Hall, Bristol (1975*)
Bjork - Plymouth Pavilions (2008*)
Thin Lizzy - Dagenham Roundhouse (1974)
Premiata Forneria Marconi (PFM) - Rainbow, London (1974)
Gentle Giant - Plymouth Guildhall (1975*)
Nektar/Sassafrass/Dr Feelgood - Roundhouse, London (1974)
Can - Plymouth Guildhall (1975*)
King Crimson - Arena, Verona (2019)
* complete guesses, but around about those years.
Of course, there are many others that could go on the list, several of which would have been at the Van Dike in Exmouth Road, but I'm buggered if I can remember much about them... for some reason!?!
Anyway, my 10 above were all brilliant gigs. As for new stuff, looking forward to catching the Norwegian band 'Oak', when they next go on tour (hopefully 2021).
Take care all of you!!