Since its establishment in 2013 HUD "O" has been organising a concert series called Rojišče. The first event in this long-running concert series took place in Ivan Cankar Institute Vrhnika with the performance of Balžalorsky/Drašler trio (Vitja Balžalorsky, Jošt Drašler and Vid Drašler). From its beginnings to 2020 over 70 events have been organised featuring many prominent musicians from the Slovene and international improv, rock and jazz scenes such as Zatko Kaučič, Kaja Draksler, Samo Kutin, Tomaž Grom, Dre Hočevar and others.
In 2016 the Rojišče concert series were expanded into a festival with the same name. Spanning over two days in Bazen Vrhnika, Festival Rojišče hosted domestic and foreign musicians from the free improv scene. The performers included Jaka Berger, Marko Karlovčec, Andrej Fon, Otto Horvath, Jure Boršič, Rieko Okuda, Marina Džukljev and others. The fourth edition of the festival took place in 2021 in a virtual form.
- HUD "O" website in Slovenian