Cue the DeLorean. Flossmoor will have its own “Back to the Future” moment next weekend when new timepieces are unveiled at the downtown clock tower. Mayor Paul Braun said the new clocks will make their debut during opening ceremonies for Flossmoor Fest on Sept. 9. “They are supposed to be installed in the next few days,” Braun said Thursday. “Back to the Future” fans recall that a downtown clock tower plays a notable role in the film. Scorched by a 1955 lighting strike, the tower’s clock is still out of service 30 years later.  . . .