A Science Fair organized by the Academy of Science of the Czech Republic is the greatest popularly educational event of its kind in the Czech Republic. Each year, it offers to visitors an interactive exposition of top-class departments of the Academy of Science of the Czech Republic, science centres, universities and other institutions, which occupy with the science in all its forms. The Science Fair introduces a great many of news and interesting things from the world of natural, technical humanities and social branches. Commercial companies present the application of scientific results in practice at the Science Fair. They bring the science into everyday life with their enthusiasm for a development and innovations. During the event, it is also possible to hear the lectures of the most important experts, to debate with them or to learn new knowledges and skills in their workshops. We realize the PR campaign, media partnership and the cooperation with youtubers for the Science Fair.