I'm from post-earthquake Christchurch, currently the kiwi capital of earth-shaking emotions.
Some audiences so worked up, so worried, frustrated and angry, that many cannot hear what is being said to them - even things said two or three times.
Your role is crucial.
We can provide the training, but to change the culture so that no one ever suffers through another 'death by PowerPoint' presentation, we suggest that you meet with your participants before and after our time with them. Make it one-on-one if possible.