Hey Julie, I did a little research and The Masque is now known as 'Barfly', heard of that?
This is the clubs website - [url="http://www.barflyclub.com/liverpool"]http://www.barflyclub.com/liverpool[/url]
You can find more info about the gig in the 'full listings' section. I've just emailed them to see if I'm allowed in, being 17, and not 18. I can normally get in anywhere, but I'd be totally gutted if I'd got tickets and driven all the way there, only to be turned away cos I had no ID!