Who?
Broadcasters, traditional and print media outlets at local or national levels.
Some ways you might involve them
Examples
Archive of AV material that can be incorporated into lessons (Belgium, Portugal and Slovenia) - https://onderwijs.hetarchief.be/ and https://arquivos.rtp.pt/ and https://cist-hudo.rtvslo.si/
Videos that help to explain complex topics in an accessible way (Germany) - https://www.quarks.de/