Legacy of Light Gala to benefit Middle Tennessee Christian School Dallas Cowboys starting quarterback and 2016 NFL Rookie of the Year Dak Prescott is the keynote speaker for the 21st annual Legacy of Light Gala benefiting Middle Tennessee Christian School (MTCS) on Saturday, April 29. In this interview-style format, Prescott will discuss how he has overcome obstacles in his life, and what it was like to step up into the spotlight, filling some of the biggest shoes in the NFL.…