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.
This year the festival has two stages with an eclectic mix of live music and acts, street food, camping and amazing craft ales from Tiny Rebel.
This year's headline acts are The Alarm, Dreadzone and Roland Gift and will be joined by The Ruts DC, The Blockheads, Captain Ska and Beans on Toast to name just a few.
Tickets are just £40 for a weekend pass or from £15 daily.