Today is officially my birthday!!!!!!!
Happy birthday! 
Along the lines of "Where did you get this fancy dress elf,why aren't you tending to our guests?" etc,before they realise that it's actually the Inquisitor they're talking to.While the rest of the nobles begin to gossip.
If we get any bigoted nobles at the ball, I suspect my Elfquisitor's reaction will be along the lines of;
Elfquisitor: Cullen, remind me? Do we really need to save Orlais from the demonic invasion?
Cullen: *Sighs* Yes, Lavellan, we do. We don't want them to be possessed by demons!
Elfquisitor: Would anyone notice?
And later, after more snide comments;
Elfquisitor: Look, I'm just saying, it wouldn't be the worst thing in the world if we did nothing.
Cullen: It's our Maker-given duty to save them.
Elfquisitor: Your Maker... I don't think the Creator's would object if we moved them to the bottom of the list?
tbh, i'm more afraid of running into this guy at the party:

I'm more afraid I'm going to BE that guy... 