HI @siriannic,
I hope you are well today and thank you for your question.
To achieve this you have to develop custom code like developed in the following topic.
https://colorlibsupport.com/t/featured-slider-with-event-espresso-event/
https://colorlibsupport.com/t/how-can-i-put-the-events-calendar-events-like-posts-in-the-slider/
Developing custom code for custom functionality is beyond the scope of support that we provide here.
If you are not a developer then you can consider hiring a developer to develop it for you. You can hire a developer from any freelance site. Colorlib recommends the developer https://www.upwork.com/freelancers/~011652ffec8865c6d5
Best Regards,
Movin