Facing History has a huge collection of resources and ideas to support teachers in all content areas to discuss events and culture. They resources specific by topic or content interest area. Videos on how to teach the lessons along with webinars. They even have support lessons for the first days of school.
Wisconsin 9/11 Memorial & Education Center
The Wisconsin 9/11 Memorial & Education Center’s website offers free lesson plans specific to teaching students in Wisconsin about the events of September 11th, 2001. While it is specific to Wisconsin, the lesson plans can be easily adapted for any location. The site also offers field trip activities and links