Hey Kevin,
Thank you for reaching out to us!
I’m so sorry to hear that you are having problems with your calendar! Let me help you to solve this!
Regarding the events missing from your month view calendar, could you please send us some examples/screenshots? I’ve just accessed your calendar and it is working properly as I can see from here.
We had an issue related to the display of events in the default Month View with WordPress 4.8.2, but the bug was solved with the release of The Events Calendar 4.5.12.3 a few weeks ago.
Regarding the events missing from the back-end of your site, that’s odd! Plugin updates won’t cause your events to be removed from the database. I would recommend you to check if someone from your team didn’t accidentally remove them. If these events were in fact removed, I would recommend that you contact your hosting provider to help you recover the database from backup.
I hope this helps! Let me know if you have any other questions and I’ll be happy to assist!
Best Regards,
Patricia