I am one of the organisers of the Algebraic Geometry and Differential Topology Seminar at the Alfréd Rényi Institute of Mathematics. The seminars are also streamed online! You can find the next one at this link.
During the years 2019-2022 I was, together with other PhD students of the University of Pisa and of the Scuola Normale Superiore, one of the organisers of the "Baby geometri seminars". These are informal seminars aimed at master students and PhD students. Here you can find the official website of the seminars.
In 2023-2024 I was the co-organiser of a 2-days and a 4-days conferences in Pisa, focused on low-dimensional topology and geometric group theory:
LiT Workshop, University of Pisa
LiT Workshop II, Centro di Ricerca Ennio de Giorgi, Pisa