We invite all managers of cultural heritage, cultural institutions, and fortified sites in Europe to join the celebration of Night of Fortresses Goes Green, with the note that registered programs should include a green component. Organizers are encouraged to create programs such as open days, guided tours, lectures, workshops, exhibitions, concerts, dance performances, and other activities that promote sustainable practices, environmental responsibility, and the preservation of cultural heritage. The goal is to connect cultural heritage with environmental care, raise visitors’ awareness of sustainable tourism, and encourage joint efforts in protecting our planet.