I think that this is a gig poster. In this sense, I'm not sure that it would be entirely effective as the fact that it is advertising a gig is unclear unless you read the very small print within the design. The potential audience would be fans of the band or people interested in gigs, so I suppose if they recognise the style of artwork for this band, they may be intrigued. However I don't think the fact it's advertising a gig is made clear enough. This is another poster that could be seen anywhere, pasted up for fans to see.