It was a costume party.

那是一个化妆晚会。

youdao

A friend once invited me to a costume party.

有朋友邀请我去参加化妆舞会。

youdao

Good, it's a costume party - I love to dress up.

不错，这是一次服装盛会-我愿意穿上盛装。

youdao

Everyone loves a costume party. ." And when it's the world's biggest comic book convention - some find it simply too hard to resist dressing up.

VOA: standard.2010.07.23

One employee who took time off for what he called a family illness was found in a time-stamped Facebook photo at a costume party, all decked out.

FORBES: Magazine Article

Her filing in Los Angeles on Friday marks an end to a romance that captivated the nation with its numerous displays of affection, including a vow renewal ceremony every year and a Halloween costume party that featured Hollywood stars.

CNN: Heidi Klum files for divorce from pop star Seal

Festivities will include a Halloween dance party and costume contest.

CNN: A cruise for everyone: 7 themed sailings