Thanks for your response.
I went through the Control Panel of my webhost and found some error log info. I don’t really understand what I’m looking for, but hope this might help:
In the PHP error_log, under the sub-heading of
wordpress/wp-admin/error_log:
I found numerous occurrences saying
PHP Fatal error: Call to undefined function array_replace_recursive() in /home4/jivacou1/public_html/wordpress/wp-content/plugins/events-made-easy/eme_events.php on line 2210
Looking at the timestamps there were a few together – I guess that was when I repeatedly tried to add a new event.
I tried again today, and sure enough another occurrence is in the log with today’s date.