Real Dictionary

masquerade
countable noun: A masquerade is an attempt to deceive people about the true nature or identity of something.
countable noun: A masquerade is an event such as a party or dance where people dress up in disguise and wear masks.
verb: To masquerade as someone or something means to pretend to be that person or thing, particularly in order to deceive other people.

masquerade in American English
a ball or party at which masks and fancy costumes or disguises are worn
to take part in a masquerade
intransitive verb: to go about under false pretenses or a false character; assume the character of; give oneself out to be
noun: a party, dance, or other festive gathering of persons wearing masks and other disguises, and often elegant, historical, or fantastic costumes

masquerade in British English
to participate in a masquerade; disguise oneself
noun: a party or other gathering to which the guests wear masks and costumes