On December 21st 1976, the UN General Assembly proclaimed 1979 as the International Year of the Child on the occasion of the 20th Anniversary of the adoption of the UN Declaration of the Rights of the Child. In June 1978, Lyudmila Zhivkova, Chair of the Committee for Art and Culture, proposed to organize an exhibition of talented children in Bulgaria to mark the occasion. This was how the idea for the ?Banner of Peace? Assembly came about, which evolved into an international festival of children?s art, held under the auspices of UNESCO. In the period of late socialism the ?Banner of Peace? movement became a national cultural brand of supranational significance. The communist regime in Bulgaria ?advertised? itself and utilized the resources of the ?soft power? in an attempt to mitigate the ideological opposition during the Cold War. Unlike ?hard power?, which uses military and economic means of coercion, ?soft power? works through images and symbols - carriers of positive suggestions: art, creativity, beauty, spiritual development, childhood, peace and cooperation. In this paper the ?Banner of Peace? Assembly is juxtaposed to another intercultural project with a political and ideological orientation - ?Plovdiv - European Capital of Culture 2019?.