(CHATHAM, N.Y.) – Ordinary Festivals, a dance-theater piece for 300 oranges, seven performers, and two knives, is among those that will be performed by Pearsonwidrig Dancetheater at PS21: Performance Spaces for the 21st Century on Friday and Saturday, August 16 and 17, 2013, as part of PS21’s comedy-themed season. Also on the program is Oashisu,…