‘The Festival takes place during the anniversary of one of the very first organised uprisings by workers in 1831 known as the Merthyr Rising. The Merthyr Rising of 1831 was the violent climax to many years of simmering unrest among the large working class population of Merthyr Tydfil where it is believed that for the first time the red flag of revolution was flown as a symbol of workers' revolt. Today we annually celebrate this symbolic event through a cultural festival of music, arts, political discussion and ideas during the anniversary of the events of 1831.’ Held Late May.