150th anniversary of the birth of Sergei Diaghilev, Russian artist and impresario Director of the State Museum of Theatrical and Musical Art in St. Petersburg, Natalia Metelitsa is also an honored worker of culture of the Russian Federation and the artistic director of the International Festival of Arts "Diaghilev. Post Scriptum". During this conference, she spoke in her lecture about the personality of Sergei Pavlovich Diaghilev through the prism of his relationship with artists, composers, dancers. The social circle of this eminent impresario, in particular his enemies and his most loyal allies, has never been studied from an artistic point [...]