Science Week (La Settimana della Scienza) occurring on September 21-28, 2019, was an extremely important week for the scientific community that saw its peak on Friday 27, with the European Researchers Night. Frascati Scienza, an association aiming at the diffusion of scientific culture, won for the 14th consecutive year the call promoted by the European Commission, in realm of Marie Sklodowska–Curie actions, thanks to the participatory science project, BE a citizEn Scientist (BEES). Citizen’s involvement and contribution to scientific research has a double impact, one in the training field and one to strengthen science-society bond. This idea is conceptualized in the acronym of the European Researchers Night 2019, BEES, that takes the idea from the homonymous insect and to their meticulous organization: in beehives, like all complex societies, the contribution of each component is fundamental for the welfare of the whole. The “great beehive BEES”, involved 34 Italian cities and partnerships with more than 60 entities, universities, institution, associations and companies. Partners, coordinated by Frascati Scienza, created a program with more than 400 events in Italy that has reached 33 million people and 30.000 visitors circa thanks to the communication campaign.