Carnival in Rio - Who ever saw wants to repeat the dose. Who never saw cannot hide the impact. The Samba School parade in Rio is one of the most impressive performances of the earth. The show is like an opera, where sets and costumes pass before the audience, telling a story through the samba, the floats, costumes and cars, every year, break the boundaries of creativity. The shows usually start at around 8:00 PM , following into the night, and may exceed, on certain days, the sunrise.