For four days during the Christmas school holidays, a long list of activities aimed at children takes place. This fair is an emblem of childhood and adolescence in the city, as children and young people see it as a key event and a must-see during the Christmas holidays.

Zagalandia is organized and financed by the Youth Area of the Barbastro City Council in collaboration with the Somontano Region, but it is made possible thanks to the work of the dozens of volunteers who collaborate in its development, as well as the associations, clubs and educational centers of the city, which organize activities within the framework of this event.