Factual error: During the live aid performance of bohemian rhapsody, Rami Malek adjusts the knob on the piano with his right hand, but during the real live aid concert Freddie adjusts it with his left hand.
Continuity mistake: While the band talks with John Reid for first time, the sun changes between shots.
Answer: It's not any specific bar, it's just a very common trope in this kind of movie to show everyday people in a bar/pub watching/responding to a massive televised event (cf. V for Vendetta). The guy sitting next to Bob Geldof is David Hepworth, who's not super famous; he's a British music journalist and was a co-presenter of Live Aid.