diff --git a/plone/app/discussion/comment.py b/plone/app/discussion/comment.py
index c9e7077..bf41967 100644
--- a/plone/app/discussion/comment.py
+++ b/plone/app/discussion/comment.py
@@ -250,16 +250,20 @@ def notify_content_object_deleted(obj, event):
 def notify_comment_added(obj, event):
     """ Notify custom discussion events when a comment is added or replied
     """
+    conversation = aq_parent(obj)
+    context = aq_parent(conversation)
     if getattr(obj, 'in_reply_to', None):
-        return notify(ReplyAddedEvent(obj))
-    return notify(CommentAddedEvent(obj))
+        return notify(ReplyAddedEvent(context, obj))
+    return notify(CommentAddedEvent(context, obj))
 
 def notify_comment_removed(obj, event):
     """ Notify custom discussion events when a comment or reply is removed
     """
+    conversation = aq_parent(obj)
+    context = aq_parent(conversation)
     if getattr(obj, 'in_reply_to', None):
-        return notify(ReplyRemovedEvent(obj))
-    return notify(CommentRemovedEvent(obj))
+        return notify(ReplyRemovedEvent(context, obj))
+    return notify(CommentRemovedEvent(context, obj))
 
 def notify_content_object_moved(obj, event):
     """Update all comments of a content object that has been moved.
diff --git a/plone/app/discussion/contentrules.py b/plone/app/discussion/contentrules.py
index eb46890..155c8c1 100644
--- a/plone/app/discussion/contentrules.py
+++ b/plone/app/discussion/contentrules.py
@@ -8,35 +8,3 @@ def execute_comment(event):
     """ Execute comment content rules
     """
     execute(event.object, event)
-
-#
-# String interp for comment's content rules
-#
-class Mixin(object):
-    """ Override context
-    """
-    @property
-    def context(self):
-        """ Getter
-        """
-        conversation = aq_parent(self._context)
-        return aq_parent(conversation)
-
-    @context.setter
-    def context(self, value):
-        """ Setter
-        """
-        self._context = value
-
-
-class CommentUrlSubstitution(adapters.UrlSubstitution, Mixin):
-    """ Override context to be used for URL substitution
-    """
-
-class CommentParentUrlSubstitution(adapters.ParentUrlSubstitution, Mixin):
-    """ Override context to be used for Parent URL substitution
-    """
-
-class CommentIdSubstitution(adapters.IdSubstitution, Mixin):
-    """ Override context to be used for Id substitution
-    """
diff --git a/plone/app/discussion/contentrules.zcml b/plone/app/discussion/contentrules.zcml
index b7f0353..8b8edc6 100644
--- a/plone/app/discussion/contentrules.zcml
+++ b/plone/app/discussion/contentrules.zcml
@@ -2,9 +2,9 @@
   xmlns="http://namespaces.zope.org/zope"
   xmlns:zcml="http://namespaces.zope.org/zcml">
 
+  <!-- Content Rules events -->
   <configure zcml:condition="installed plone.contentrules">
 
-    <!-- Content Rules events -->
     <interface
       interface="plone.app.discussion.interfaces.ICommentAddedEvent"
       type="plone.contentrules.rule.interfaces.IRuleEventType"
@@ -32,9 +32,9 @@
   </configure>
 
 
+  <!-- Content rules subscribers -->
   <configure zcml:condition="installed plone.app.contentrules">
 
-    <!-- Content rules subscribers -->
     <subscriber
       for="plone.app.discussion.interfaces.ICommentAddedEvent"
       handler=".contentrules.execute_comment"
@@ -55,259 +55,6 @@
       handler=".contentrules.execute_comment"
       />
 
-    <!-- Content rules string substitutions -->
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentUrlSubstitution"
-      name="absolute_url"
-      />
-
-   <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentUrlSubstitution"
-      name="url"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentParentUrlSubstitution"
-      name="parent_url"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentIdSubstitution"
-      name="id"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentTitleSubstitution"
-      name="title"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentParentTitleSubstitution"
-      name="parent_title"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentDescriptionSubstitution"
-      name="description"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentTypeSubstitution"
-      name="type"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentReviewStateSubstitution"
-      name="review_state"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentReviewStateTitleSubstitution"
-      name="review_state_title"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentCreatedSubstitution"
-      name="created"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentEffectiveSubstitution"
-      name="effective"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentExpiresSubstitution"
-      name="expires"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentModifiedSubstitution"
-      name="modified"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentCreatorsSubstitution"
-      name="creators"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentContributorsSubstitution"
-      name="contributors"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentSubjectSubstitution"
-      name="subject"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentSubjectSubstitution"
-      name="keywords"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentFormatSubstitution"
-      name="format"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentLanguageSubstitution"
-      name="language"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentRightsSubstitution"
-      name="rights"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentIdentifierSubstitution"
-      name="identifier"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentOwnerEmailSubstitution"
-      name="owner_emails"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentReviewerEmailSubstitution"
-      name="reviewer_emails"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentReaderEmailSubstitution"
-      name="reader_emails"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentEditorEmailSubstitution"
-      name="editor_emails"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentContributorEmailSubstitution"
-      name="contributor_emails"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentManagerEmailSubstitution"
-      name="manager_emails"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentMemberEmailSubstitution"
-      name="member_emails"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentUserEmailSubstitution"
-      name="user_email"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentUserFullNameSubstitution"
-      name="user_fullname"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentUserIdSubstitution"
-      name="user_id"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentLastChangeCommentSubstitution"
-      name="change_comment"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentLastChangeTitleSubstitution"
-      name="change_title"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentLastChangeTypeSubstitution"
-      name="change_type"
-      />
-
-    <adapter
-      for="plone.app.discussion.interfaces.IComment"
-      provides="plone.stringinterp.interfaces.IStringSubstitution"
-      factory=".contentrules.CommentLastChangeActorIdSubstitution"
-      name="change_authorid"
-      />
-
   </configure>
 
 </configure>
diff --git a/plone/app/discussion/events.py b/plone/app/discussion/events.py
index ec60da0..31253b7 100644
--- a/plone/app/discussion/events.py
+++ b/plone/app/discussion/events.py
@@ -12,8 +12,9 @@ class DiscussionEvent(object):
     """
     implements(IDiscussionEvent)
 
-    def __init__(self, context, **kwargs):
+    def __init__(self, context, comment, **kwargs):
         self.object = context
+        self.comment = comment
         for key, value in kwargs.items():
             setattr(self, key, value)