SocialCG meetings calendar

I prefer keeping things together, i.e. on the forum. But on the other hand things on the forum might be improved to keep the overview. I created Improving forum + overall community accessibility for that (one improvement here is if @how installs a plugin to give us a dropdown menu showing all the various locations where AP activity is ongoing, fep, socialcg, bbb, jitsi, gh, conf, etcetera).