Good evening Mark and welcome back!
I would love to help you with this topic.
Just to set expectations, as you know, the scope of our support is mostly to get our customers started on the right track and to help them in case of issues.
We unfortunately do not provide complete support for customization.
With that in mind, with a bit of customization, I believe this would feasible using template overrides. You might want to read our Themer’s guide to get a sense of how that works.
Here are a couple of related articles on achieving this with WPML to get you started:
- https://wpml.org/forums/topic/displaying-posts-in-all-languages/
- https://wpml.org/forums/topic/display-all-posts-in-any-language-on-archive-page/
You could probably push things a bit further with the help of a customized wpml-config.xml file.
Here is a good thread on that topic: https://theeventscalendar.com/support/forums/topic/automatically-duplicating-added-event-calandar-items-on-publish-with-wpml/
Let me know if that helps.
Have a great day!
Geoff B.