By Denny Dyroff, Entertainment Editor, The Times Brand X Brand X, which is headlining shows at the Kennett Flash (102 Sycamore Alley, Kennett Square, 484-732-8295, http://www.kennettflash.org) on May 18 and 19 has a similarity to horror film characters like Freddie Kreuger and Chucky – just when you think they’re dead and gone for good, they reappear. The London-based band started in 1975 and...