I have tried this is the result:
I notice that all your events are already expired, so I tried to update that specific shortcode and set the following option to ON:
That's when I got the following error:
To see if this is not a conflict any content, I tried adding MEC Test draft page width Include Expired Events option set to ON. Still no event. Then I tried to Show Only Expired Events set to ON and it works: https://screencast-o-matic.com/watch/cbX0fp2tw2
. I left it here: http://www.ab-net.us/?page_id=6710
. Can you try adding an event in the future and then check again with Show Only Expired Events set to OFF and Include Expired Events to ON?
Note to try that on your local which is using the updated versions of theme and plugins.