The only person I could send along would probably be Oscar - he might be pressured into going after his 'success' at the last ball (in massive sarcasm quotes). That, and he's probably still single at this point.
Thinking about it, Aster's also technically a noble, though she rejected it to become a mordecai. She definitely wouldn't be there as a Delancy, but would there be security or anything? Just wondering...
Not sure how much good he'll be in a fight, though XD
Speaking of which, just how much violence is there going to be in this attack? Would this be potentially deadly?