Some of the study activities require transcripts or recordings of speeches. Here are a few English-language repositories to get you started. Research similar sources for all your working languages.
https://www.americanrhetoric.com/
https://obamawhitehouse.archives.gov/
http://www.britishpoliticalspeech.org/speech-archive.htm
Some of the study activities require videos of interpreters in diplomatic settings. Some of these need to be in your working languages, but the ones focusing on behaviour and positioning can be in any language. Here are some videos to get you started. Find other suitable videos for your working languages.
Donald Trump – Sergio Mattarella
https://www.youtube.com/watch?v=ZgAhYvbbD5g
Barack Obama – Xi Jinping 2013
https://www.youtube.com/watch?v=agGug3drZIs
Alain Berset – Hasan Rohani
https://www.rts.ch/play/tv/lactu-en-video/video/hassan-rohani-sur-sa-rencontre-avec-alain-berset?id=9691723
Vladimir Putin – Narendra Modi 2015
https://www.youtube.com/watch?v=QOV-zYI3wQ0
Queen Elisabeth – Hugo Chavez 2015
https://www.youtube.com/watch?v=Lrwbw2vntfM
Queen Elisabeth – Sergio Mattarella 2015
https://www.youtube.com/watch?v=k8x0LLBWrtk