The event was organised by the Professor Balthazar association in partnership with the Rudjer Boskovic Institute, CARNet and the Network of Science Popularisers.
The event is the fourth such annual happening. The previous three Science Picnics were visited by more than 70,000 people.
Admission to programmes of the Science Picnic, which will be taking place at Pavilion 6 of the Zagreb Trade Fair Centre, is free.
The event is supported by the ministries of science, education and sports, tourism and culture and it will be held under the auspices of President Kolinda Grabar-Kitarovic.