Any communications you send out encouraging stakeholders to engage in the process should be designed to be as easy to understand as possible. This means keeping the information concise, using simple language, avoiding acronyms where possible, and incorporating explanatory images eg infographics.
The example image shown below has been taken from Energy Saving Trust’s social media feed. In this case the post is advertising an online webinar for businesses. As you can see the information is kept concise, bullet points have been used to make the information more digestible, the acronym used (LEZ) has been clearly expanded in its first use, and the image conveys the key focus for the webinar.
At Energy Saving Trust, we have found this style of promotional material has been effective at encouraging people to attend events.