Demonstrators take part in a protest called by Catalan separatist movement Democratic Tsunami outside the Camp Nou stadium in Barcelona on December 18, 2019, prior to the “El Clasico” Spanish League football match between Barcelona FC and Real Madrid CF. – Tension in Spain’s north-east region boiled over in October when demonstrations and riots caused the original La Liga fixture between Barcelona and Real Madrid to be postponed. Democratic Tsunami, the protest group advocating another independence referendum for Catalonia, has called publicly for its supporters to gather at Barcelona’s Camp Nou stadium from four hours before kick-off at 1900 GMT. (Photo by Pau Barrena / AFP)