cān jiā huà zhuāng wǔ huì

attend a costume party

In Chinese, '参加化妆舞会' means to take part in a gathering where people wear costumes. This expression emphasizes the fun and creativity of dressing up, often for celebrations such as Halloween or themed events. The word '参加' means to participate or attend, while '化妆舞会' specifically refers to a costume or masquerade ball.