Masquerade :

1.a party, dance, or other festive gathering of persons wearing masks and other disguises, and often elegant, historical, or fantastic costumes.
2. a costume or disguise worn at such a gathering.
3. false outward show; façade; pretense: a hypocrite's masquerade of virtue.
4. activity, existence, etc., under false pretenses: a rich man's masquerade as a beggar.