Hi there!

Thanks for your query.

There is no default option to add different hover image there, sorry about that. Please use the following code snippet to change the hover image for all:

.event-list-item:after {
    background-image: url(../images/ticket-bg.png);
        }

Please use your desired image URL in the above code.

Here is all about custom code placement in Helix Ultimate: https://www.joomshaper.com/documentation/helix-framework/custom-code-css-js-meta

Hope this helps!

Best Regards