if a guy mate of mind asked me to go to a girls aloud concert, i would look at them and raise my eyebrow, whether its a best mate or not. Yeh the gyals might be fit, but its more of a thing gyals would go to see, or a gf and bf, not two bois together. Tell him to take a girl. And when you say he may or not be gay, is it the fact he has girls aloud tickets you think he is gay? maybe he justs wants you to go for a laugh because there will be other gyals at the concert or something. Personally i would say no becasue i would find it a little strange. If it was something like arctic monkeys, then i would say GO!!!, but gyals alound is a tad gyalie!