In a matrix, link to entries with a future date
Forgot to take the entry status into account + an additional check for the sectionhandle to cover the custom route.
This solved it for me, if you have a better suggestion I'm all ears.

{% for link in block.slideLink.status('live', 'pending') %}
    {% if link.section.handle == 'events' %}
        &lt;a href="{{ siteUrl }}events/{{ link.slug }}" class="btn btn-sm btn-danger"&gt;lees verder...&lt;/a&gt; 
    {% else %}
        &lt;a href="{{ link.url }}" class="btn btn-sm btn-danger"&gt;lees verder...&lt;/a&gt; 
    {% endif %} 
{% endfor %}