I’ve listed here resources from around the web to put together a week long (or month long- depending how deep you would like to dive into this topic) unit study on peacemakers of the world; starting with definitions and children’s interpretations of peace, art and song stimulation to understand peace and then moving on to looking through the life and works of peacemakers around the world.
The focus then shifts to India, and we pick the life and work of Mahatma Gandhi to study deeper, while touching upon the history and Geography of British India and the Freedom Struggle (suited best to beginners, ages 6 years and up)

What is peace? UNICEF CANADA
The Power of Peace by Global Goals
Peacemakers of the World by Montessori for the World
Morningside Centre for Teaching Social Responsibility Teachable Moments
Learning for Justice (formerly Teaching Tolerance) Lessons
One World Peace Posters (pdf downloads)
Diversity study – What we can learn from A box of crayons
India Unit Study and Printable State and UT maps bilingual cards (with names in English and Hindi )


Gandhi Unit Studies from around the web

Gandhi Study Notebook Pages by Homeschool Den
Gandhi Lesson – Learn Bright
Mahatma Gandhi Learning Pack by Elementary Nest
Teachers Pay Teachers Lessons on Gandhi and the End of British Imperialism
Literature Unit for Gandhi by Demi
A march to the Sea: Activities by Two Lions
The Relevance of Gandhi by Making History Real