This is my book idea: Looking into different Rights of Passage in several different cultures.
Overview: Distinct cultural praxis and nuance are most often apparent in commemorations of life stage transitions. Ritual, artifacts, and beliefs can overtly manifest at a birth of a child, birthdays, coming of age, graduations, anniversaries, courtship, weddings, retirement, funerals, etc. Each culture has its own expression during these milestones.
It would be a fun study to bring these to the light and also help serve as a guide to become more culturally proficient.