Change "There are no latest topics. That's sad." to a less depressing message

[opcourdis]

You can also change the message to fit the category with the “after” pseudoclass :

.category-next-events .topic-list-bottom::after {
content: ‘No event for the moment’;
}

.category-next-events .topic-list-bottom .footer-message {
display: none;
}

You may add language pseudo class if you have a multilingual site.