I try to incorporate pieces of information and other training into my own - giving proper credit and seeking permission when necessary of course. I have used courses from the National Child Traumatic Stress Network https://learn.nctsn.org/course/index.php?categoryid=3 information from the Child Trauma Academy http://childtrauma.org/cta-library/ and information from resilient communities USA.
There are a million different directions you can go. I would offer establishing a firm foundation about ACEs, toxic stress and the health effects, then incorporating broader concepts of well-being for the community with specific actions that members can undertake to improve their neighborhoods. That will eat up your three hours! ha ha