Hello David,
Thanks for reaching out, you have a great question there.
It is most likely possible but would require some custom coding, which is beyond the scope of our support. Nevertheless, I can point you in a direction worth exploring.
You can create custom queries with the tribe_get_events() function. You can find more info on it’s usage here and here.
I strongly suspect you will need to check the Countdown_Widget.php file, around line 137, public function get_output() .
If you need someone to help you out, you can find a list of freelancers in the below link, who could help you out and have no affiliations with us whatsoever.
https://theeventscalendar.com/knowledgebase/find-a-customizer/
Let me know if this helps you out.
Thanks and cheers,
Andras