Each week the teacher can focus on a different type of people or a specific country for teaching about. Children can do reports on it. Mobiles of children of the world can be made. Teacher can have cutouts for the children to color of different races of people from a variety of places. Children can learn a certain cultures dance.
Children can make board games of going to different areas.
Using facts they know about the countries to make up there game. Children can List differences and similarities in themself and someone else, or in a different type of people. All should be accepted. If someone isn't liked, maybe we haven't looked deep enough to find something we can like about them. We don't have to have everything in common to have fun.