Hello Ted Edwards
Please help me go to site
developers.google.com/maps/documentation/javascript/get-api-key and do the step and get your API key
and find and open file modules/mod_jo_facebook_events_pro/tmpl/default.php and go to line 29 and change
<script src="https://maps.googleapis.com/maps/api/js?sensor=false&ver=1.0" type="text/javascript"></script>
To
<script async defer src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap"
type="text/javascript"></script>
Or can you send me your API key and joomla admin via contact form and we will help you fixed it
Best regards
Bach Pham