Knox Heritage is celebrating 50 years of preserving, safeguarding and celebrating the structures and spaces that tell the story of Knoxville. PechaKucha Knoxville and Knox Heritage have teamed up with nine expeditious high-speed slide presentations about different aspects of Knox Heritage and its cause. Doors for the free program open at 6:30 p.m.; presentations begin at 7:20 p.m. Food and drink are available for purchase.