Rich in political and cultural resonance as well as contemporary relevance, the documentary essay “ Rehearsals for a Revolution ” marks a promising feature debut for Iranian actress-turned-helmer Pegah Ahangarani . Her compelling personal perspective on 40-plus years of post-Revolutionary Iran provides a chronicle of great hopes and even greater disappointments. In it, she plays with the Iranian concept of yād , which encompasses both memory and how the past returns to mark the present. A