Misago/misago/templates/misago/thread/posts/index.html

<ul class="posts-list">
  {% for post in posts %}
    {% if post.is_event %}
      {% include "misago/thread/posts/event.html" %}
    {% else %}
      {% include "misago/thread/posts/post.html" %}
    {% endif %}
  {% endfor %}
</ul>