A masquerade ceremony (or masked rite, festival, procession or dance) is a cultural or religious event involving the wearing of masks.
Examples include the West African and African Diaspora masquerades, such as Egungun Masquerades, Northern Edo Masquerades, Nsukka (omabe festival), Caribbean Carnival (which is called Mas) and Jonkonnu.
References
Masquerade ceremony Wikipedia(Text) CC BY-SA