Visit the Philadelphia Zoo for the Region’s Most Festive Halloween Celebration PHILADELPHIA, PA, 2013-10-04 — /travelprnews.com/ — The Philadelphia Zoo will host its annual two-weekend “Boo at the Zoo” Halloween celebration on Saturday, October 19th, Sunday, October 20th, Saturday, October 26th and Sunday, October 27th from 10 a.m. to 4 p.m. During “Boo at the Zoo” children… Read the full press release