masquerade

An assembly or party of people wearing (usually elaborate or fanciful) masks and costumes, and amusing themselves with dancing, conversation, or other diversions.

(slang) A cosplay event at which costumed attendees perform skits.

(figurative) An act of living under false pretenses; a concealment of something by a false or unreal show; a disguise, a pretence; also, a pretentious display.

The act of wearing a mask or dressing up in a costume for, or as if for, a masquerade ball.

(figurative) An assembly of varied, often fanciful, things.

(no longer used) A dramatic performance by actors in masks; a mask or masque.

(no longer used, rare) A Spanish entertainment or military exercise in which squadrons of horses charge at each other, the riders fighting with bucklers and canes.

To take part in a masquerade; to assemble in masks and costumes; (loosely) to wear a disguise.

(figurative) To pass oneself off as a different person or a person with qualities that one does not possess; also, to make a pretentious show of being what one is not.

(figurative) To appear as something else.

(rare) To conceal (someone) with, or as if with, a mask; to disguise.