On September 28, 2019 at The Children’s Memorial Health Institute there was organised the XXXIII Science Festival. It is another year in which our Institute actively participated in events, which promote science. This year’s meetings were devoted to autoimmune diseases and microscopes. The participants had the opportunity to get both theoretical and practical knowledge in form of lectures and a visit in the Microscope Laboratory. The meetings were led by dr Joanna Bierła, mgr Maria Ejmont and dr Agnieszka Sowińska. Almost 40 participants took part in the event. Natalia Szyperek and Diana Wiśniewska were responsible for organisation of the Science Festival at CMHI. We would like to thank the participants for numerous coming, and the leaders and organizers for their time and knowledge. People interested in conducting meetings next year are encouraged to send their candidatures to the Scientific Research And International Cooperation Division , tel. 22 815-13-72; e-mail: email@example.com. See you next year!