I think it would be useful to have all our promotion materials in the community wiki or in a public Nextcloud folder. A link to the source should be also available if we still have it. Only exception would be not yet disclosed announcements, that we don't want to leak before the official announcement.
I don't see any reason why this some materials are currently in a 'secret' Nextcloud directory, that you can only access if you know the link. This would also make it easier for future events to see that material we already have or can reuse and that is missing. And would allow KDE fans to print some KDE material them self.