diff --git a/event/templates/event/calendar.html b/event/templates/event/calendar.html
index dfdb867..db2dd26 100644
--- a/event/templates/event/calendar.html
+++ b/event/templates/event/calendar.html
@@ -35,24 +35,28 @@
         {% for activity in day.list %}
             <div class="cal-event">
                 <span class="cal-event-id">{{ activity.id }}</span>
-                <span class="cal-event-name">{{ activity.title }}</span>
+                <span class="cal-event-name">{{ activity|get_herited:'title' }}</span>
                 <span class="cal-event-start-date">{{ activity.beginning | date:"j/m/Y H:i" }}</span>
                 <span class="cal-event-end-date">{{ activity.end | date:"j/m/Y H:i" }}</span>
-                <span class="cal-event-location">{{ activity.places.all | join:", " }}</span>
+                {% with activity|get_herited:'places' as places %}
+                <span class="cal-event-location">{{ places.all | join:", " }}</span>
+                {% endwith %}
                 <span class="cal-event-description">{{ activity.description }}</span>
                 <span class="cal-event-url">{% url "event:activity" activity.id %}</span>
 
                 {% if activity.has_perm %}
                 <span class="cal-event-has-perms">1</span>
-                <span class="cal-event-min-nb-perms">{{ activity.min_perm }}</span>
-                <span class="cal-event-max-nb-perms">{{ activity.max_perm }}</span>
+                <span class="cal-event-min-nb-perms">{{ activity|get_herited:'min_perm' }}</span>
+                <span class="cal-event-max-nb-perms">{{ activity|get_herited:'max_perm' }}</span>
                 <span class="cal-event-nb-perms">{{ activity.staff.count }}</span>
                 <span class="cal-event-subscribed">{% is_enrolled activity request.user %}</span>
                 {% endif %}
 
-                {% for tag in activity.tags.all %}
+                {% with activity|get_herited:'tags' as tags %}
+                {% for tag in tags.all %}
                 <span class="cal-event-tag">{{ tag.name }}</span>
                 {% endfor %}
+                {% endwith %}
             </div>
         {% endfor %}
     {% endfor %}