Here are other working groups of interest, sponsored by Internet2, but not directly sponsored by InCommon.
Consultations/Document Reviews
InCommon Technical Work Update and Plans
Internet2 website listing of working groups
InCommon Assurance AD Silver Cookbook
Presentation on New InCommon Working Groups, August 2014 (.pdf)
Internet2 Support Levels for Trust and Identity Working Groups (Google Doc)
Guidelines for Trust and Identity Working Group Chairs and Flywheels
Working Group Call Agenda template
Tools for Publicizing Working Groups, Recruiting New Members and Onboarding