Some examples of open bargaining:

Concord, Massachusetts:  http://www.labornotes.org/2016/02/seven-steps-opening-bargaining ,  http://concord.wickedlocal.com/article/20151119/NEWS/151115718

St Paul, Minnesota: St Paul teachers fight for their students learning conditions

Nation-wide: http://america.aljazeera.com/opinions/2016/2/why-teachers-are-striking.html