To join any Working Group (WG), go to https://lists.trustoverip.org/, log in with the email address of your ToIP Foundation membership, then subscribe to the mailing list for each WG you wish to join. You will automatically be mailed a calendar invite for the WG meetings. If you did not receive the calendar invite, please reach out to operations at trustoverip dot org.
A Task Force (TF) is a group that organizes under the umbrella of a Working Group (or, for a Foundation-wide activity, under the Steering Committee) to accomplish a specific task or set of tasks. Each TF has its own home page on this wiki—many of them also have their own mailing lists and Slack channels (see each TF home page for details).