diff --git a/organize/browser/service.py b/organize/browser/service.py
index d9ed5bf..21dffd8 100644
--- a/organize/browser/service.py
+++ b/organize/browser/service.py
@@ -161,7 +161,7 @@ class ServiceManagerView(BaseView):
         self.request.response.redirect(self.registrationUrl())
         return 'redirect'  # let template skip rendering
 
-    def overview(self, includeCategories=None):
+    def overview(self, includeCategories=None, skipInactive=False):
         result = []
         classific = []
         category = None
@@ -170,6 +170,8 @@ class ServiceManagerView(BaseView):
         for cat, idx, svc in svcs:
             if includeCategories and cat not in includeCategories:
                 continue
+            if skipInactive and not svc.isActive():
+                continue
             level = 0
             if cat != category:
                 term = serviceCategories.getTermByToken(cat)
@@ -442,6 +444,8 @@ class ServiceView(BaseView):
 
     def allowRegistration(self):
         context = self.context
+        if not context.isActive():
+            return False
         if not context.allowDirectRegistration:
             return False
         return (self.capacityAvailable() or self.context.waitingList
@@ -580,6 +584,8 @@ class RegistrationTemplateView(BaseView):
         return (svc.category, svc.getClassification(), svc.start)
 
     def allowRegistration(self, service):
+        if not service.isActive():
+            return False
         return (self.capacityAvailable(service) or service.waitingList
                 or service in self.getRegisteredServices())
 
diff --git a/organize/interfaces.py b/organize/interfaces.py
index 89d567d..d5e83f5 100644
--- a/organize/interfaces.py
+++ b/organize/interfaces.py
@@ -174,6 +174,11 @@ class IServiceManager(Interface):
 
     services = Attribute('A collection of services managed by this object.')
 
+    def isActive():
+        """ Return True if object is active, e.g. based on effective/expiration
+            dates or workflow state.
+        """
+
 
 class IServiceGroup(Interface):
     """ A group of related services or a general service definition,
@@ -182,6 +187,10 @@ class IServiceGroup(Interface):
 
     services = Attribute('A collection of services belonging to this object.')
 
+    def isActive():
+        """ Return True if object is active, e.g. based on effective/expiration
+            dates or workflow state.
+        """
 
 serviceCategories = SimpleVocabulary((
     SimpleTerm('event', 'event', u'Event'),
@@ -292,6 +301,11 @@ class IService(Interface):
     resources = Attribute('A collection of one or more resources.')
     registrations = Attribute('A collection of client registrations.')
 
+    def isActive():
+        """ Return True if object is active, e.g. based on effective/expiration
+            dates or workflow state.
+        """
+
     def register(client):
         """ Register a client with this service. Return an IRegistration
             object if the registration is successful, otherwise
diff --git a/organize/service.py b/organize/service.py
index 4a868fc..b06c17f 100644
--- a/organize/service.py
+++ b/organize/service.py
@@ -71,6 +71,9 @@ class ServiceManager(object):
         if self.clientSchemasFactory is not None:
             self.clientSchemas = self.clientSchemasFactory()
 
+    def isActive(self):
+        return True
+
     def getServices(self, categories=[]):
         return self.services
 
@@ -161,6 +164,9 @@ class Service(object):
     def getToken(self):
         return self.name
 
+    def isActive(self):
+        return True
+
     def getAvailableCapacity(self, ignoreWaiting=False):
         if not ignoreWaiting and self.getNumberWaiting() > 0:
             return 0