In 1998 the Kluže Ambient Festival started out with a series of international exhibitions called ARTileria Kluže, launched by and a group of local artists.
In 2002 the B-51 Cultural Society took over the role of organiser of cultural events at the site and conceived the Ambient Festival as a launch pad for entertainment and the arts in the Upper Soča region. It has been organised annually and in collaboration with Bovec Tourism Organisation and supported by the Ministry of Culture and the . However, due to financial cuts at the national level, the 2013 festival edition was cancelled.
The organisational concept underlying Kluže Festival was to present events in a series of "weekend packages", in order to enliven the various venues. The festival cooperated with the Central-European Mittelfest, staged just over the border in Cividale del Friuli (Italy), which has also contributed some performances at Kluže, and other regional partners from the neighbouring Friuli (Italy) and Carinthia (Austria). At first the programme thematised the war tragedies and exile-related subjects, thus maintaining a creative historical connection with the Soča-Isonzo region.
The next editions presented theatre performances from Slovenia, Italy, Austria, Croatia, Bosnia-Herzegovina, and Israel, usually in two parts, a week in July and another week in August. The opening event of the 2007 edition also involved the creators of the film Chronicles of Narnia, who shot one of the film's scenes in this part of Slovenia.
All events in the festival were free of charge.
- Kluže Fortress website (in Slovenian)