Divi does not ship with a search.php. Therefore, we need to create one ourselves if we want to to include EME events in the WordPress search, as described by Franky in the FAQ https://www.e-dynamics.be/wordpress/faq/
All credit for this goes to Mark Hendriksen here -> https://www.markhendriksen.com/create-custom-search-result-page/
He even describes how to add the Divi global header and global footer, as well as any Divi layouts you would like to have on the results page. Very nice. You will also want to add some CSS so that it matches the rest of your site.
I recommend reading through the entire article, but The very basic steps are as follows
1. Create a Child theme – there a several guides on the internet, if you are unsure
2. Find the index.php in the Divi theme folder /wp-content/theme/divi, copy it to your child theme folder and rename it to search.php
3. Now add Franky’s code from the FAQ to search.php