costume party

柯林斯词典

1. N-COUNT A costume party or costume ball is a party at which the guests try to look like famous people or people from history, from stories, or from particular professions. 化装舞会[美国英语]
...a pair of angels' wings and a halo that she'd worn to a costume party just a few months before. ...仅仅几个月前她穿到化装舞会上去的一对天使翅膀和光环。