MACIECA 21st Annual Conference Calendar When: September 16, 2014 – September 18, 2014 all-day 2014-09-16T00:00:00-04:00 2014-09-19T00:00:00-04:00 Where: Radisson Hotel Valley Forge 1160 1st Avenue King of Prussia, PA 19406 USA Contact: Mid-Atlantic Chapter International Erosion Control Association Event website