As a concert organizer, he established the important Novi Rock festival, and brought numerous eminent international acts to Slovenia and/or Yugoslavia, including: 23 Skidoo, Amebix, Angelic Upstarts, Anti-Nowhere League, Christian Death, DOA, Dinosaur Jr., Discharge, Dubliners, Einstürzende Neubauten, The Fall, GBH, Henry Rollins, Iggy Pop, Jane's Addiction, The Jesus & Mary Chain, Killing Joke, The Mission, Nick Cave, Pere Ubu, Pixies, Ramones, Siouxsie and the Banshees, The Sisters of Mercy, Sonic Youth, UK Subs, Youth Brigade, Swans and others.
His behaviour and his journalistic or artistic works, which were often too avant-garde and politically incorrect for the time, (intentionally or unintentionally) provoked reactions from the communist regime of the then-Socialist Republic of Slovenia and SFR Yugoslavia: he lost his membership in the ruling political party- the League of Communists of Slovenia, faced prosecution and even served short prison terms few times.
In the next year, as a retaliation, he "tested" the authorities' and citizens' nerves by playing Deutschland über alles on the air in his radio show (a version performed by Nico).
[2] The system of the non-aligned SFR Yugoslavia was not so rigid as the other communist states, such as those in the Eastern Bloc for instance, so most of the time the Yugoslav rock scene was left alone to work freely.
For example, in 1982, Vidmar organized a concert in support of the independent Polish trade union Solidarity; he also worked with the highly provocative act Laibach, a member of the Neue Slowenische Kunst collective which used totalitarian Nazi art and Socialist Realism for artistic reasons as camp or for stirring controversy etc.