In conjunction with the Friends of Pine Grove Furnace. Andre Weltman, chairman of the Friends of Pine Grove Furnace State Park, will discuss the connection between the 19th century charcoal iron industry and today’s South Mountain landscape. Modern trails and campsites often overlap with still-visible remnants of an important part of iron making: transforming the forests into charcoal fuel for the region’s iron furnaces. Begins at 7:00 pm.