Tags: Convention.
For other uses check Intervision (disambiguation).The Intervision Song Contest (ISC) was the Eastern Bloc equivalent to the Eurovision Song Contest. Its organiser was the Intervision the network of Eastern Europe television stations. It took place in the Forest Opera in Sopot Poland.The ISC was organised between 1977 and 1980. It replaced the Sopot International Song Festival (Sopot ISF) that had been held in Sopot since 1961.