Amends GS 115C-84.2(d) as title indicates. Requires Chatham County Schools to open no earlier than August 10 (currently, prohibited from opening earlier than the Monday closest to August 26), excluding year-round schools. Deletes the provisions of subsection (d) concerning waiver of the opening date requirements upon a showing of good cause.  Amends GS 115C-174.12 allowing Chatham County Schools, if the school calendar concludes the fall semester before December 31, to administer assessments before the conclusion of that semester. Applies beginning with the 2025-26 school year.