Hi, Chris.
You can see the fields that are required by default starting at Line 1721 of /wp-content/plugins/the-events-calendar-community-events/src/Tribe/Main.php:
'post_content',
'post_title',
'EventStartDate',
'EventStartTime',
'EventEndDate',
'EventEndTime',
I tested and these are required even though there’s no red asterisk next to them. However, since the dates and times are auto-filled, it wouldn’t trigger the error message unless the user would remove the defaults.
Please let me know if this answers your question.