Here's a brief narrative of a forgiveness ritual written by Alice Walker:
In the Baemba tribe of South Africa, when a person acts irresponsibly or unjustly, he is placed in the center of the village, alone and unfettered. All work ceases, and every man, woman, and child in the village gathers in a large circle around the accused individual. Then each person in the tribe speaks to the accused, one at a time, about all the good things the person has done in his lifetime. All his attributes, good deeds, strengths and kindnesses are recited carefully and at length. This tribal ceremony often lasts several days. At the end, the tribal circle is broken, a joyous celebration takes place, and the person is symbolically and literally welcomed back into the tribe.