Darius Rucker and Easton Corbin have joined the Country Thunder Wisconsin festival lineup on July 23, while Rodney Atkins, Eric Church and Clay Walker have been added to the Country Thunder Arizona roster on April 10. Neal McCoy will also perform at both festivals. Country Thunder Wisconsin will take place July 21-24 in Twin Lakes, Wis., with headliners Lady Antebellum, Martina McBride, Rascal Flatts and Zac Brown Band. Meanwhile, Country Thunder Arizona will be held April 7-10 in Florence, Ariz., with headliners such as Jason Aldean, Toby Keith and McBride. Additional performers will be revealed in the coming weeks. Tickets are now available.