costume party

noun
🔊/ˈkɒstjuːm pɑːti/
🔊/ˈkɑːstuːm pɑːrti/
(especially North American English)
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  1. a party where all the guests wear special clothes, in order to look like a different person, an animal, etc.化装舞会
    • They celebrated New Year's Eve with a costume party.他们举办了一个化装晚会庆祝除夕。
    compare fancy dress