The delegation headed by Yerevan Mayor Taron Margaryan, at the behest of Saint Petersburg Governor Georgi Poltavchenko on May 21 would leave for the northern capital of Russian Federation to take part in the events dedicated to holiday of Saint Petersburg foundation. Within the frames of the visit mayor Taron Margaryan is going to participate in “ Harmony of Variety: the role of effective urban management in the modern world” international assembly.