Apologies if I missed one that has already been held. But I saw a member census of beehaw, which was really interesting. I'm not suggesting gathering of any personally identifying info, but more generally getting a sense of who is here on kbin.
Throw in climate stuff for me too. I don't get too into it, because it's easy to doom spiral about the worthlessness of individual effort in the face of corporate giants, but still a very clear issue.
From my perspective personal responsibility matters regardless of what other people/companies/countries are doing. It may be a small effort, but you will show other people that making change is possible.