Clue 1:
Start with the name of an Iron Maiden song and show opener (which may or may not have been played live), add one, and then you will find an event which inspired this Maiden song.
Clue 2:
In the song lyrics, you will find the name of a Black Sabbath song, an animal, an influential Aussie rock band, a seminal trash metal album, and a NWOBHM band.
Clue 3:
The lyrics recount past actions, but the story is told from a present-day point of view.
You better get away to guess another day: Invaders, Empire of the Clouds, Futureal, Be Quick or be Dead, Quest for Fire