A CORSO WHAT?

According to the Oxford dictionary, a CORSO is:

1) (in Italy and some other Mediterranean countries) a social promenade.
       1.1) a street used for social promenades, or where races and parades were formerly held.

The Corso is a carnival attraction in Teresina, capital of the Piaui state, and is considered the world's largest event of its kind according to the Guinness Book: parade of theme floats and people in costumes.

This year it will be held on the 22nd of February and it will showcase 800 decorated trucks and an estimated audience of 300,000 people.

       Guide to the city (in Portuguese)