 Examples of such adaptation include the Waldorf schools in Israel and Japan, which celebrate festivals drawn from these cultures, and classes in the Milwaukee Urban Waldorf school, which have adopted African American and Native American traditions.Such festivals, as well as assemblies generally, which play an important role in Waldorf schools, generally center on classes presenting their work.Religion classes are usually absent from United States Waldorf schools,  are a mandatory offering in some German federal states, whereby in Waldorf schools each religious denomination provides its own teachers for the classes, and a non-denominational religion class is also offered.