Update:
I have what I think is a finalized version of the leaflet.
Of course there could be more improvements, and patches are welcome, but I think it can be used as is.
The main changes from the previous time: I added some CentOS contact info, and the SIG section now mentions four SIGs which were most active on centos-devel recently.
The sources:
* https://gitlab.cee.redhat.com/afedorov/centos-leaflet
The rendered PDF version is also in the repo:
* https://gitlab.cee.redhat.com/afedorov/centos-leaflet/-/blob/main/centos-lea...
I printed a test variant using a generic office printer. It was usable, but printing it properly on a thicker paper would work better.
So, who is up for the printing task? :)