More than half a million people braved chilly weather to mark the 35th anniversary on Saturday of the fall of the Berlin Wall, the organizers reported. Berlin Mayor Kai Wegner said he was convinced that the anniversary event would remain a special memory for many. Among the events in the once divided capital was a four-kilometre Open Air Installation of 5,000 posters erected along where the wall once ran. The posters, which were up by Friday, were created by children and adults with the theme: “We uphold Freedom.” Copies of banners used by East Germans in the demonstrations leading up to the f…