Well, now we know why Nick wasn't at Kevin's party.  He's been sick!  If you watched his Instagram video from this morning, he sounds terrible!  He said he had a bad cold (not Covid), lost his voice, and spent three days in bed, but is feeling better now.  Poor thing!
Edit:  The last two minutes of that video were freaking hilarious!  Even if you don't watch the whole thing, watch the end!