Nurses laid off when the North Adams Regional Hospital closed abruptly two weeks ago picketed outside federal bankruptcy court in Springfield on Monday. A separate hearing in state court that had been set for Tuesday has been postponed. Inside the federal courthouse on State Street, the bankruptcy court held a status conference in the bankruptcy case filed Thursday by North Adams Regional Hospital's parent organization, Northern Berkshire Healthcare. Northern Berkshire filed for Chapter 7 liquidation Thursday. The hospital closed March 28.