One of the biggest nights takes place Thursday at the Lawrence County Junior and 4-H Fair on US 50 between Bridgeport and Sumner. The annual Youth Livestock Auction will occur at the show arena at the barns at the west edge of the fairgrounds. The auction will culminate a year of hard work by young 4-H livestock producers from across the county as their animals are bid on and sold The auction begins at 6:30 p.m.