After a cancellation of the Science Festival in 2020 due to the Covid-19 pandemic, the resumption of this activity in 2021 was expected. Two highlights for the Fête de la science at IJCLab: Friday October 8 with the reception of schoolchildren and Sunday October 10 with the reception of the public. An opportunity to meet scientists at their workplace, to participate in numerous workshops and experiments and to discover the world of research! The Sunday public is called to present a health pass. Wearing a mask and respecting barrier gestures are applicable in all cases and throughout the visit. The link to the program at the laboratory: http://www.sciencesociete.universite-paris-saclay.fr/laboratoire-de-physique-des-2-infinis-irene-joliot-curie-ijclab/