Fix event_urls.py.

ticdesk_cmsstuff/events_urls.py

@@ -4,5 +4,5 @@ from . import views
 
 urlpatterns = [
     url(r'^$', views.events, name='events'),
-    url(r'^event/(?P<cn>[a-z][a-z0-9-]+)$', views.event, name='event_by_cn'),
+    url(r'^event/(?P<cn>[a-z][a-z0-9-]+)/$', views.event, name='event_by_cn'),
 ]