A new boutique electronic music festival will make its debut this September as Fort X transforms Slovenia's medieval Mokrice Castle into a day festival for underground house and techno. Taking place on 5th September 2026, the inaugural edition brings together Dixon, Maceo Plex, Jimi Jules, Âme DJ, Butch, Nic Fanciulli and more inside a medieval fortress surrounded by woodland just outside Ljubljana. Rather than building a temporary festival site, Fort X has been designed around the architecture and landscape of Mokrice Castle itself, a 15th-century fortress. Stages are woven through hidden courtyards, woodland paths and centuries-old stone walls, with bespoke lighting and projection mapping transforming the historic setting after dark before sunrise sessions carry through into Sunday morning.