Okay, I get it. You want to upsell wherever possible 
I went with a different approach and got it to work — I created an alternate Header layout with the Conditions set to the Events Archive page.
Now… I am trying to set up a Custom Layout for the Events Single page and running into similar issues — the Layout Builder won’t override the MEC single page templates. For what it’s worth, MEC offers advice on how to do that for those that are custom-coding their own template pages:
https://webnus.net/dox/modern-events-calendar/overriding-mec-single-event-page/
My first try at this was to copy:
/pro/framework/views/renew/wp-page.php (and the wp-single.php) files and rename them:
/pro-child/single-mec-events.php
…but that just caused the Events to come out with the plain version of Renew’s post format, NOT with the Layout Builder version (and yes, I did set the Conditions to “Post Type / is / Event”.
Can you offer some solution to this?
Before you reply with your stock answer about this being “beyond the scope of our theme support”, please note that your Layout Builder is part of your theme, and Modern Events Calendar is included with your theme, so I don’t think it’s unreasonable to ask that they work together, is it? I have noted that you provided support to get MEC to work with the Looper…
Thanks for your time and attention!
Carlos