Hi,
check this conference:
It is more for academics than activists. But they have a few sessions on CE:
###CE related panels:
https://nomadit.co.uk/easst/easst2018/conferencesuite.php/panels/6198
Related:
https://nomadit.co.uk/easst/easst2018/conferencesuite.php/panels/6189
&
https://nomadit.co.uk/easst/easst2018/conferencesuite.php/panels/6199