Kenny Chesney will headline a concert at Gillette Stadium near Boston, on July 26, according to the tour section of his Web site. Billed as the New England Country Music Festival, Chesney will be joined by Keith Urban, LeAnn Rimes, Gary Allan and Sammy Hagar. ... In related news, Urban and Carrie Underwood will launch their new tour with two shows (Jan. 31 and Feb. 1) at Mohegan Sun Casino in Uncasville, Conn., according to Urban's Web site. Only a few other Urban/Underwood concert dates have been revealed: Feb. 16 in Roanoke, Va.; March 7 in Omaha, Neb.; and March 11 in San Jose, Calif.