“Wonder” is the organizing theme for the second TEDx Nashville event — and speaking of wonders, in just a year this gathering of public intellectuals has outgrown its inaugural home at MBA, necessitating a move to TPAC. (And by the time you read this, even it may have sold out.) An offshoot of the popular TED (Technology, Entertainment, Design) conference in Long Beach, Calif., whose guests have included anyone from Bill Gates to the late father of fractals Benoit Mandelbrot, the symposium offers up a smorgasbord of ideas on the principle that its audience’s curiosity isn’t limited to one subject or discipline. This year’s participants represent acting and international activism (a rare public hometown appearance by Ashley Judd), literal rocket science (NASA technologist Dr. Andrew S. Keys), aid for women escaping lives of abuse and prostitution (Magdalene founder Becca Stevens), the treasures of Fisk’s Stieglitz Collection (Dr. Carol Creswell-Betsch, daughter of the collection’s first curator), climate change and forced migration (Climate Voices founder and MBA grad Max Webster) — and that’s not even to mention appearances by musical talents Jill Sobule, David Mead, Jimmy Wayne and Roger Cook, stepping outside their usual areas of expertise. Tickets are $65 and available at www.tedxnashville.com, along with a full list of speakers.