* Singer-songwriters John Hiatt, far right, and Nanci Griffith will be among the headliners at the Newport Folk Festival, Sept. 20 at the Greek Theatre. Tickets go on sale Sunday. . . . Tickets will be available Saturday for the Spice Girls, Aug. 16 at Glen Helen Blockbuster Pavilion. . . . Earth, Wind & Fire, the O'Jays and the Isley Bros. will be at the Arrowhead Pond of Anaheim on Sept. 10 and the Greek Theatre on Sept. 11. Tickets go on sale Sunday. . . . The Steve Miller Band plays Aug. 20 at the Greek and Aug. 22 at the Irvine Meadows Amphitheatre. Tickets will be available Saturday. . . . "Hootenanny '98," featuring X and Reverend Horton Heat, among others, has added a July 5 date at Oak Canyon Ranch in Irvine. Tickets go on sale Saturday. . . . Savage Garden will be at the Greek on July 10. Tickets go on sale Sunday. . . . Tickets will also be available Sunday for Santana and Los Lobos, Aug. 13-16 at the Greek. . . . After selling out two shows at the Hollywood Palladium, Bauhaus has added a third date at the hall on July 12. Tickets are available now. . . . On sale today: the Urge, June 25 at the Roxy; Candlebox, July 23 at the Glass House; and Front 242, July 25 at the Palace. . . . Available Saturday: Herbie Hancock & the Headhunters, June 22 at the Hollywood Athletic Club; and War, El Chicano and others, July 25 at Blockbuster Pavilion. . . . On sale Sunday: Deep Forest, July 23 at the Wiltern Theatre. . . . The Creatures' July 14-15 shows have been moved to the Palace.