They made things that were pretty. They made things that were fun. Everyone had a wonderful marvelous, beautiful time. For older students, the activity would be modified to follow the societal order of the planar world described in the book Flatland, A Romance of Many Dimensions, by Edwin A. Abbott. People of all groups have a contribution to make.
People are more alike than they are different.
Differences in customs and attitudes can be an asset to society. Prejudice and stereotyping is usually based on lack of information. Understanding others will enrich our own lives. How do I convey this, verbally and non-verbally. You could use an alphabetical seating chart to overcome this division.