<form class="calendar-ical-form" action="{% url 'event_generate_ical_for_calendar' %}" method="POST">
  <input name="page_id" type="number" hidden value="{{ page.id }}">
  {% csrf_token %}
  <button class="btn btn-primary" title="Download calendar in .ics format" type="submit">
    {% block button_text %}Download Calendar (ical){% endblock %}
  </button>
</form>
