[Kurt's here because he's playing bodyguard, that's really all there is to this. But he's been shoved into a costume sans the bodysuit he was almost forced into because he really doesn't need it and is instead looking around and so isn't self-conscious about his looks. He's a Spartan and used to cryo to boot, being half-naked around people is the norm.
But you know the wig really wasn't needed but he's ignoring it as he just sort of lurks near the buffet to figure out if he should a) enjoy it for now or b) just ignore it and go guard Halsey more. But he's so not dancing.]