I just spotted this game yesterday! The Allergy, Asthma and Sinus Center of Knoxville, Tennessee is sponsoring Peanut Free Night with the Tennessee Smokies on July 30, 2012. It's a double-header, with a start time of 5:30 PM. The flyer on the Allergy Center's Facebook page states the park will be "scrubbed, scoured and cleaned of all traces of peanuts".
For more information and tickets, visit the Tennessee Smokies website.