Welcome to the Dark Ages was a three-day event organised by The Justified Ancients of Mu Mu (the JAMs; more widely known as The KLF), held in Liverpool in August 2017. The event heralded a revival of the creative partnership between Jimmy Cauty and Bill Drummond, under the name with which they first recorded and released music together in 1987. The duo had last worked together in 1997, when, as 2K, they staged an art performance and released a single, "Fuck the Millennium", and, as K2 Plant Hire Ltd, hatched a plan to build a "People's Pyramid" to celebrate the new millennium.
During the event, the JAMs launched their new work, a novel called 2023: A Trilogy, and revealed fresh plans to build a "People's Pyramid". The event also marked 23 years since Drummond and Cauty controversially burnt one million pounds sterling and an end to their self-imposed moratorium on discussing it.