Who?
People and places associated with particular religious faiths or elements of culture such as language groups or country/local associations.
Some ways you might involve them:
Examples
Educational resources on Jewish faith (Scotland) - https://www.scojec.org/resources/resources.html
Educational theatre visits (Germany) - https://www.landestheater-tuebingen.de/Theaterpaedagogik/Theater_und_Schule.html