Having had a joint career in education and city management, I always enjoyed returning to the classroom. I have presented to grades 4 through 12. My advice is keep it grade appropriate and relevant.Most students have no idea what services are provided by city government. In elementary I alsways started with their trip to school and pointed out that roads, garabge police, safety issues that may have had an impact on that trip. When teaching at the high school level, I actually created a class called "Our Town" and had students run for office and re-create the city after a unit on zoning ordinances and allowable use. They had to present and explain their creation of a new city with proper zoning and type of government. They were quite creative.Have them problem solve one of your actual issues.Keep lecturing to a minimum and enjoy .