The three shortlisted acts will play the special show at LSO St Luke’s in London next week (Wednesday 26 September).
Tickets are only available to fans through a ballot system, which is open now and closes on Wednesday 19 September.
The gig is free, but there will be a £5 donation per ticket – proceeds of which go to War Child.
Fans can apply for tickets here. Further gigs will be unveiled in the coming weeks.
The full list of Mercury nominations is as below: