I haven't been to a gig for ages.
Does a folk club meeting count? If so, 14th November, lots of performers/participants (not me).
If not, then the last "concert hall" gig that I recall is either the Strawbs (acoustic) at the Robin 2, Bilston (though the Robin 2 is more of a club style venue than a concert hall) (June 2019) or Echo and the Bunnymen at Birmingham Symphony Hall (May 2018).
I'm not one for concert hall/stadium style gigs and much prefer pubs and clubs.