Actress Kelly Preston, whose son Jett Travolta died earlier this year, will talk publicly in October about how she and her husband, actor John Travolta, have dealt with their grief. Preston, 46, will appear on a panel titled “Grief and Resilience” at a conference hosted by California first lady Maria Shriver, according to a conference spokeswoman. Jett, 16, was found unconscious on January 2, while on vacation with his family in the Bahamas’ West End