Carnival is a festive season which occurs immediately before Lent; the main events are usually during February. Carnival typically involves a public celebration or parade combining some elements of a circus, mask and public street party. People often dress up or masquerade during the celebrations, which mark an overturning of the norms of daily life. This dates back to celebrations before the former longer Advent season (40 days now reduced to about four weeks), or with harvest celebrations of St. Martin's Day. The Carnival in Brazil is a major part of the Brazilian Culture, and it is sometimes referred to by the Brazilians as the "Greatest Show on Earth". The first ever true carnival expression of this Brazilian festivity, officially recognized by Carnaval historians in Brazil, took place in Rio de Janeiro, with the "préstitos", very similar to a musical processions, in 1641, when John IV of Portugal was crowned as a King and parties were celebrated in Rio public streets.