El Entierro de la Sardina, in English the burial of the sardine, is a Spanish custom corresponding to the end of carnival.
Most cities finish their carnival celebrations with a parody of a funeral parade where the public in costumes fake lamenting the death of a sardine.
This tradition finds its origin in the symbolism of the beginning of lent, when you are supposed to leave behind (bury) all the excesses and sins of the carnival period.