Documentarian Bruce Kennedy stands by the grave of his great-great-great-grandfather, Dr. Smith Azer Boughton, or “Big Thunder,” one of the principal leaders of the Anti-Rent rebellion. Kennedy will show a rough edit of his film “Righteous Rebellion” at the Octagon Barn in Knox on Wednesday, Oct. 30. The public is invited to meet the filmmaker at 6, followed by the screening at 7 p.m.