Hey @Abby,
Unfortunately, while it’s quite simple to build the post type, it’s a complex thing to connect the post type to Events in a way similar to current Venues and Organizers.
So with that in mind, I would recommend just diving into The Events Calendar’s code itself and reading how the integration of Venues, Organizers, and Events is all done inside the plugin itself.
If you’re not familiar enough with code to embark on this, then unfortunately the only other recommendation I have would be to hire a professional developer to assist you. We have a list of developers here that might be a good place to start → http://m.tri.be/18k1
We cannot help with custom coding, so just to be frank there’s not much more I can share about this customization – you’ll have to take the reins from here. If there’s anything else I can help with, though, let me know!
Sincerely,
George