There are many synonyms for the term "costume party", including masquerade, fancy dress, dress-up party, Halloween party, and themed party. A masquerade is a formal costume event where attendees wear masks to conceal their identities. Fancy dress parties involve dressing up in a costume or costume-like clothing for a specific theme or occasion. Dress-up parties typically focus on children dressing up in costumes. Halloween parties involve costumes and festive decorations associated with the holiday. Themed parties are events where the costumes are designed to match a specific theme, such as a 1920s party or a superhero party. Whether it's a masquerade ball or a Halloween bash, costume parties are always fun and exciting events to attend.