costume party

costume party (plural costume parties)

1. A social gathering of people wearing disguises or costumes, and amusing themselves with dancing, conversation, or other diversions.
   • 2010 October 7, Nate Jones, “Candidate's Sexy Santa Photos Leaked”, in Time:

     Virginia Democratic Congressional candidate Krystal Ball went to a costume party when she was 22 dressed as a sexy Santa.

• costume ball

• masquerade

• “costume party”, in OneLook Dictionary Search.