Disney and "American Idol," two of America's hottest franchises for young people, combine for the Demi Lovato and David Archuleta concert on Aug. 8 at Target Center. Lovato, who released her first CD last fall, has performed with the Jonas Brothers on tour and in the movie "Camp Rock." Archuleta, who released his first album last fall, was runnerup on "Idol" in 2008. Tickets, priced at $49.50 and $39.50, will go on sale at 10 a.m. Saturday at Ticketmaster outlets and Target Center box office.