One of the easiest ways to assist effective collaboration between teachers is to create a shared Google Calendar so all parties involved can get greater clarity.  You can easily set up meeting dates and include the agendas, goals, teacher roles, in the event details.  You can also share out important due dates and any other information you need to have in order to collaborate effectively.

A shared Google Calendar will not only help improve communication but can also improve clarity as well as accountability.  To have effective collaboration, especially in a PLC setting, you need to be able to hold each person accountable for their role in the group.  You can easily make this clear in the event details and use that to double check that you are prepared before you meet.

The following video will show you how to create a shared calendar in Google Calendar.