Tonight is the grand finale for the third edition of Launch Tennessee’s “The TENN” master accelerator. Three East Tennessee start-ups are among the six finalists vying for a $35,000 “Traction Award” prize. They are Branch Technology from Chattanooga and two Knoxville companies – Innovasan and Sing and Spell. In addition, three alumni of “The TENN” will share their stories, and one of them is Knoxville-based Vendor Registry. The event is from 5:30 to 8 p.m. CDT at City Winery in Nashville.