Hi Rob,
Ultimately the page(s) used for the calendar should be visible along with all other WordPress pages.
I am glad that you have had ‘discussion’ about this. However I have purchased a product to receive a year of updates (the clock is now ticking) and support (which is no longer of use to me) for these kinds of issues.
I also note that nobody has attempted to login to my website using the details I gave Modern Tribe to even see if a temporary fix is possible.