Explanation:
As of modern times, for fun and because it is tradition. It enables people to dress up once a year in cute, scary, and/or creative costumes of their choice. Originally, Halloween was celebrated by Christians in order to honor the people who left for Heaven. As you may know, America was founded on Christian principles so the tradition of Halloween continues.
In the early years of the Middle Ages, most people in Europe lived in small farming villages. Everyone knew his neighbors, and there was little need for last names. But as the population expanded and the towns grew, a need arose to find ways to differentiate between two people who shared the same first name.
You could talk about social change and order. This was a main topic going on during 2020, with the Black Lives Matter movement. And you don’t have to just discuss that movement but you can talk about other parties such as natives Americans, Immigrants, Women, etc.