diff --git a/dav_events/utils.py b/dav_events/utils.py
new file mode 100644
index 0000000..85377a6
--- /dev/null
+++ b/dav_events/utils.py
@@ -0,0 +1,13 @@
+import logging
+from django.utils import timezone
+
+from .models import Participant
+
+logger = logging.getLogger(__name__)
+
+
+def purge_participants():
+    now = timezone.now()
+    for p in Participant.objects.filter(purge_at__lte=now):
+        logger.info('Purge participant \'%s\'', p)
+        p.delete()
diff --git a/dav_events/views/base.py b/dav_events/views/base.py
index 03655ed..40a95ce 100644
--- a/dav_events/views/base.py
+++ b/dav_events/views/base.py
@@ -1,5 +1,11 @@
 from django.views import generic
 
+from ..utils import purge_participants
+
 
 class HomeView(generic.TemplateView):
     template_name = 'dav_events/home.html'
+
+    def get(self, request, *args, **kwargs):
+        purge_participants()
+        return super(HomeView, self).get(request, *args, **kwargs)