<P> Various "samba schools" compete in a huge parade . Each school presents a different theme, which they expose through their costumes, dance, music, and the allegorical cars or "carros alegóricos", huge vehicles decorated according to the theme designed specifically for the parade . </P> <P> The schools are responsible for choosing their own themes, which usually revolve around historical happenings or some sort of cultural or political movement . </P> <P> The most famous (and usually the winners) samba schools are: Nenê de Vila Matilde, Gaviões da Fiel, Vai - Vai, Camisa Verde Branco, Peruche, Mocidade Alegre, Rosas de Ouro, Vila Maria, Mancha Verde, Tatuape, and Império da Casa Verde </P> <P> Vai - Vai is the oldest school and has been the Special Group champion most times (15 total, including the 2015 championship). It also is the most popular, for it has a larger fanbase and many supporters among the people of the city . </P>

Catholic holiday of lent in rio de janeiro brazil