{% load simple_translation_tags l10n %}

{% with event|get_preferred_translation_from_request:request as event_title %}
    <h3><a href="{{ event_title.get_absolute_url }}">{{ event_title.title }}</a></h3>
    <p>
        <span>{{ event.start_date|localize }}</span> /
        <span>{{ event.category.get_translation.title }}</span>
    </p>
{% endwith %}