{% extends "admin/change_form.html" %}
{% load i18n %}
{% block object-tools-items %}
  {% if original.pk %}
    <li>
      <a href="{% url 'admin:foirequest_foievent_changelist' %}?request={{ original.pk }}">
        {% trans "Events" %}
      </a>
    </li>
  {% endif %}
  {{ block.super }}
{% endblock %}

Add link to events on foirequest admin page
Add link to events on foirequest admin page