In Barcelona, for carnestoltes as it is also known here, there is the big parade or Rua (Catalan) in which each guild shows off their float and group choreography, and then there are small ruas held in parallel celebrations at neighborhood level.
As you may know, Carnival starts with Dijous Gras (Fat Thursday) and finishes with Ash Wednesday right when Lent begins. It is based in old pagan winter festivities normally drenched with wine and open to other liberties which Greeks and Romans were so prone to and such habits were later adopted by Christians in their own let's say penitent way, interpreting this brief period as a time for a relaxation break before dealing with the fasting hardships of Lent. Only for a hearty meal and a little wine, of course.
Around here, on Ash Wednesday, we make a funeral and bury a sardine, yes, we like to be different. Who wants to have sardines after having so much food and drinks. We have even created the figure of a guy, Carnestoltes, the appointed King of the Carnival, that dies every year, in some towns of a sudden death and in some others including Barcelona, after a public trial in which he is sentenced to death. The king, always ends up burnt to ashes, and as you may have guessed already, sometimes alive and sometimes being already a corpse. Whatever the way, he is given a non religious burial in accordance with his dubious nature and as a way to purify our repentant community from these days of sinful behavior. Obviously there is still a lot of pagan in our Christian souls somehow.