Renames the title of Article 29D of GS Chapter 115C to Religious Activity and Cultural Expression (currently, titled as Student Prayer and Religious Activity). Enacts new GS 115C-407.40, governing cultural expression at graduation ceremonies, as follows. Requires that any student who is, or is eligible to be, enrolled as a member of a State or federally recognized Native American tribe be permitted to wear objects of cultural significance as part of the student's regalia at any graduation ceremony for a school within a public school unit in which the student is a graduating participant. Specifies that an object of cultural significance includes bird feathers and plumes.