Lawmakers and business people have tapped all-male idol group Arashi to perform at a festival in early November celebrating the enthronement of Emperor Naruhito, sources close to the matter said Wednesday.The organizers, who have also requested the attendance of the emperor and empress through the Imperial Household Agency, hope bringing in Arashi will add to the celebratory mood at the event, to be held in the Imperial Palace Plaza in central Tokyo on Nov. 9.Emperor Naruhito ascended the throne on May 1, following the abdication of his father former Emperor Akihito the previous day.