| If you need to create a content type that inherits from the “Event” content type, you will notice that OOTB it’s not listed in the List Content Types group. That’s because it is in the _Hidden group and in order to use it you will have to be sneaky enough to move it out of there! 
So, in order to do this you’ll need to go to a Calendar on your site and go to the Settings page. From there you need to turn on Content Type Management in the Advanced Settings. Once you’ve selected “Allow management of content types?”, you’ll be able to see the Content Types listed for the Calendar list and there you’ll find the “Event” Content Type. 
Now you can actually go into the List Content Type for Event and from there you’ll be able to dive even deeper and go to the Parent Content Type by following the link in the List Content Type Information Section at the top of the page: This link takes you to the Site Content Type for “Event” and from there you can modify the Group that Event is listed under, thus making it visible for you to use when creating new content types that inherit from this one. Once you’re on the Event page, just go to the “Name, description, and group” link in the Settings area and add it to the List Content Types group.  
Now you’ll be able to create a new content type that inherits from the Event parent type. |