According to the National Weather Service's hour-by-hour forecast for tomorrow night (Hourly Weather Forecast for Knoxville - weather.com), it should be mostly clear and 43 degrees at 7:00 PM, with winds out of the NNW at 9 mph, for a wind chill of 38 degrees. By 10 pm, conditions are predicted to be clear at 37 degrees, with wind still out of the NNW at 11 mph, for a wind chill of 29 degrees. They call for an overnight low of about 27 degrees, with a wind chill of 17.
It will be a good opportunity to dress in multiple layer of orange, including the noggin and hands.