The Sonisphere Festival have announced an historic event for their second night this July: Adam Lambert will join Queen on stage for their headlining set. Queen last performed at Knebworth Park in 1986 to what was their largest British audience ever, and which turned out to be the band’s final performance with frontman Freddie Mercury. Tickets for the festival are on sale now, and you can buy them here. We’ve added the date to our Pop Diary. Hit like below if you’ll be attending.