You might find these resources useful:
Hurd, Dr. Tracey L. Nurturing Children and Youth: A Developmental Guidebook (Boston: UUA Publications, 2005).
Patton, Sally. Welcoming Children with Special Needs (PDF) (Boston: UUA Publications, 2004).
Schwendeman, Jill M. When Youth Lead: A Guide to Intergenerational Social Justice Ministry (Plus 101 Youth Projects) (Boston: UUA Publications, 2007). A useful resource if the group wishes to explore more options for Faith in Action.
Williams, Betsy Hill; Rzepka, Jane; Sawyer, Ken; Kron, Keith. About Right and Wrong (Boston: uu&me! Publishing, 2014). Questions of right and wrong are answered from a Unitarian Universalist perspective, and several child-centered vignettes of questionable morality engage the reader in considering if the behavior in question is right, wrong, or somewhere in between. Part of the Little Books about Big Stuff series.
Deep Fun is a compilation of games and community-building activities to keep on hand to fill time if sessions run short.