At the recent (April, 2016) conference and Shabbaton in Philadelphia sponsored by the Mordecai Kaplan Center on Wrestling with Jewish Peoplehood I led a Shabbat discussion on Inclusion and Exclusion based on the Passover Seder, particularly the passage about the four children , one wise, one wicked, one simple, and one who does not know how to ask. Who is really welcome? Who is excluded? Is the wicked child really evil? The study sheet I prepared may be helpful for your own discussions.