I highly recommend the StoryPath unit plan by Margit McGuire titled "Freedom's Summer." During this unit, students become personally involved with civic education and the Civil Rights Movement of the 1950s and 1960s. The unit is targeted at students in grades 5-8. The curriculum and teacher's guide (including all needed resources) is available for free online.
For teachers hoping to teach similar concepts (e.g., service learning, civic responsibility, making community change) in the younger grades, I recommend the StoryPath unit titled "The Park." It is also available for free online.