Focus on the Family has a very nice resource on "The Gift of Peace" with many age-appropriate activities.

Key Verse: John 14:27
“Peace I leave with you; my peace I give you. I do not give to you as the world gives. Do not let your hearts be troubled and do not be afraid.”

After a brief description of various types of peace, the resources has the following sections:

Preschool Activity
School-Age Activity
Tween Activity
Time With Your Teen

Excerpt from https://www.focusonthefamily.c.../the-gift-of-peace/:

The Gift of Peace

Throughout the Christmas season, children will undoubtedly encounter the phrase “Peace on earth, good will toward men” and the baby Jesus described as “the Prince of Peace.” How do we model the true meaning of such words while chaotically trying to conquer the holiday checklist?

We begin by understanding the difference between peaceful and peace. It is one thing to live in a continual state of serenity without stress or conflict. It is quite another to experience a sense of well-being grounded in a right relationship with God, even during trying circumstances.