Hi: sorry to see you’re hitting difficulties, here.
I’m not sure that it is a bug – so much as the plugin is expecting certain elements to be present that are perhaps missing. It looks like you’ve got some custom templates in there (there seems to be at least one event template override within a tribe-events template in your theme) and I wonder if any changes in those overrides might be conflicting.
Can you try renaming the themes/gameplan/tribe-events directory to themes/gameplan/x-events? You can of course restore after testing, but this will let us know if the problem lies in a custom change or indeed if it lies elsewhere.
Let me know what you find 🙂