I’ve shared various iterations of Joss Colchester’s Systems Innovation website and events before – the url is https://systemsinnovation.io/
There’s now an accompanying Slack channel: https://bit.ly/3ee5q61 – already with 341 members.
Related list of systems thinking groups (kept updated at https://docs.google.com/document/d/19ji4L38JVVJiWj9EiSglY–q_rn_fr6a7G4MjnuDYK0/edit?usp=sharing
For COVID-19, Rob Young has set up a facebook group to collate all systems-related updates – https://stream.syscoi.com/2020/04/07/please-join-and-contribute-covid-19-resources-systems-community-facebook-group/
Systems thinking network (I own this on behalf of the collective!)
systems thinking facebook groups at
the ecology of systems thinking https://www.facebook.com/groups/774241602654986 (I and others own this on behalf of the collective!)
systems sciences https://www.facebook.com/groups/2391509563
SCiO – Systems and Complexity in Organisation (I am a director): www.systemspractice.org.uk/events
linkedin group – members only https://www.linkedin.com/groups/8146034 Membership very cheap!
(Nick Ananin’s systems thinking events map worldwide) https://goo.gl/4PXkCg
Other key systems thinking groups:
Illuminate/SIGNAL – building the field of systems change https://mailchi.mp/cf0bdef6497a/illuminate
Systems Convening – Bev and Etienne Wenger-Trayner are writing a manual, and a good group has formed:
https://groups.io/g/systems-convening and https://wenger-trayner.com/systems-convening/