The party is charming, if only because Crowley isn't sure how much can be expected for a party in a gymnasium contained inside a train car. They would be a lot more charmed if it wasn't for the music playing. Crowley's smile immediately falls flat, almost to a scowl. 

"I don't actually know." they mutter in response,  squeezing lightly at the angel's arm. "Quick, let's find the alcohol."