Just got the info on this from a friend, couldn't find on Wonderworks Site (http://www.wonderworkstn.com) site, but did find on the Knox News Site:
WonderWorks Homeschool Preview Days are September 13th - 19th. The homeschool teacher + 3 guests of his/her choice will receive complimentary admission with their valid homeschooling ID. This special is limited to 4 guests PER family, even if both parents are registered homeschoolers. Also, please limit your visit to one day during this time. This allows space for other homeschoolers on other days. If you have any questions, please call 865-868-1815 or e-mail [email protected].

If you have more than 3 students and live in TN, it is also East TN appreciation days during the week: http://wonderworkstn.wordpress.com/