Subject: Information related to the series of summer schools on the ISM of galaxies

Description: Iinternational summer schools on the ISM of galaxies (GISM; Galaxies' ISM):
- https://ismgalaxies2021.sciencesconf.org/
- https://ismgalaxies2023.sciencesconf.org/
- https://ismgalaxies2025.sciencesconf.org/