Hey there!
Great question. I’m afraid that The Events Calendar is designed to only show Event posts. The calendar itself is a built as a custom post type archive template that is only applicable to the tribe-events post type.
That said, it may (or is likely) possible to get other post types in there by writing a custom filter for the calendar query that includes other post types in the loop. While that level of custom development is something we are unable to support here in the forums, we do have a list of recommended developers who might be willing to help you get there.
Does this help answer your question? Please let me know.
Thanks,
Geoff