Snow Patrol headlined The Witchwood in Ashton (small but legendary Manchester venue) on a Thursday night, probably 2001ish - shortly before they became famous.
They were supported by a band called Terra Diablo, if I remember correctly, who were absolutely amazing & owned the night - easily the best band of the evening.
Never heard of Terra Diablo again, which is a great shame, whereas Snow Patrol went on to commercial success etc.
As an aside, our band headlined the same venue on the Friday, to about twice as many people as the Snow Patrol gig, and rocked it!
...and who remembers us, eh?