note Knoxville Roll Practices
Check out the University Outdoor Program. Pretty sure it's still in the bottom of the TRecs building. That be a good place to start. They do a weekly roll practice and have done weekly strokes and concepts in the past. Tues and Thurs evenings when I was involved.

UTOP is a great resource for students and faculty. Take advantage and the paddling group will work itself out. Knoxville is an awesome part of the country to be a paddler.