One day event October 8th (Saturday) in western Iowa if you are in the area. The vineyard is located just outside of Glenwood, Ia.
Weather forecast is partly sunny high of 77.
Admission was $10.00 in 2009 which was the last time I attended. HyVee is sponsoring the event this year, so I expect there will be discount tickets available at area stores.
http://www.kingscrossingvineyard.com/html/renaissance_festival.html