Carnevale is a traditional Christian celebration which marks the beginning of Lent - the 40 days prior to Easter.  It typically involves public celebrations including parades, street parties,  and other entertainment often combining elements of a circus.  Elaborate costumes and masks allow people to set aside their everyday identity and experience a hightened level of frivolity prior to the serious time of Lent during which many indulgences are foregone.  Welcome to the illusion of Carnevale!