MADRID (Billboard) - Miley Cyrus is to play her first concert in Spain, at the Rock in Rio Madrid 2010 festival on June 6. A week ago, Bon Jovi (June 4), Shakira and Rihanna (both June 5) were the first performers confirmed for this year's Rock in Rio Madrid. Cyrus was added to the list Friday, with the news that June 6 will be a family day, with tens of thousands of children expected. Rock in Rio Madrid will take place over two weekends -- June 4-6, and two unconfirmed days of the following weekend -- at Rock City, a 200,000-square-meter (50-acre) ...