Presenting the two fairs, Zagreb Trade Fair Centre (ZV) director Dina Tomsic said both events would be bigger and better than any previous editions.
This year's Christmas Bazaar brought together women from 47 countries, which is the biggest number of countries so far.
The event was organised by the Professor Balthazar association in partnership with the Rudjer Boskovic Institute, CARNet and the Network of Science Popularisers.
The fair is featuring 266 exhibitors, including Chinese publishers. It is open from 10am to 8pm and on Sunday, the last day of the fair, it will be open until 9pm.