Hey Jamie,
Thanks for reaching out. Having a private calendar in general is unfortunately not easily possible—your specific goals here are especially challenging to pull off, because even harder to pull off than a private calendar is having one public calendar and one private one on the same site.
I am sorry to bear that news—we discuss some of the main methods for making a private calendar in this Knowledgebase article → https://theeventscalendar.com/knowledgebase/making-members-calendar/
I’d recommend giving that article a read and seeing if either option therein is one you can put to use. Other than those options, the only way to implement this would be with extensive code customization. 🙁
Sorry to disappoint! Please let me know if there are any other issues or questions I can try to help with.
Sincerely,
George