I have the same problem. My Events are not showing up in the calendar view. We have not yet updated to 4.8.1 , nor have we updated to the latest version of Calendar Pro. It just seem the events disappeared off the calendar today.
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PLEASE LEAVE FOR SUPPORT
Reporting the same issue as: https://theeventscalendar.com/support/forums/topic/monthly-calendar-not-displaying-events-after-update-to-wp-4-8-2/
So sorry about the conflict. Last night our team announced The Events Calendar 4.5.12.3 is now available, which resolves an issue related to the display of events in the default Month View. This issue (https://core.trac.wordpress.org/changeset/41496) was introduced with WordPress version 4.8.2 and impacts all previous versions of The Events Calendar–all users are encouraged to update as soon as possible. No other changes were made to any other areas of the plugin, and we apologize to anyone who might have been affected by this issue.