Starting as of today, CTF365 offer this opportunity to its users: Creating CTF competitions using CTF365 platform. All you have to do is to send us an email with:
Subject: New CTF competition
Where you'll describe what you want to do, who is it for (beginners/advanced) and everything you think we should know about your competition.
If approved, you'll have to provide the image/s and together we'll make it happened.