Is there a way that I can set the registered users so that they can post a public event, but it has to be approved? Can't find it, but I thought that there was a way...
The current calendar in MyBB doesn't support a moderation system for event postings.
We're looking in to this for the future, but if you need this functionality now, perhaps you could request it on the MyBB Mods site? http://mods.mybboard.com