noun
A costume party is a social event where attendees dress up in costumes based on a theme or specific characters.
-
The annual charity gala will include a costume party this year.
-
I heard there's a costume party happening at Sarah's house next weekend.
-
Let's crash that costume party at Jake's place, it's gonna be lit!
-
Life is like a costume party, you never know who's hiding behind the mask.