diff --git a/symposion/proposals/managers.py b/symposion/proposals/managers.py
deleted file mode 100644
index b908c7b68edacd41b8bde56e20b4b8053b4430b3..0000000000000000000000000000000000000000
--- a/symposion/proposals/managers.py
+++ /dev/null
@@ -1,27 +0,0 @@
-from django.db import models
-from django.db.models.query import QuerySet
-
-
-class CachingM2MQuerySet(QuerySet):
-    
-    def __init__(self, *args, **kwargs):
-        super(CachingM2MQuerySet, self).__init__(*args, **kwargs)
-        self.cached_m2m_field = kwargs["m2m_field"]
-    
-    def iterator(self):
-        parent_iter = super(CachingM2MQuerySet, self).iterator()
-        m2m_model = getattr(self.model, self.cached_m2m_field).through
-        
-        for obj in parent_iter:
-            if obj.id in cached_objects:
-                setattr(obj, "_cached_m2m_%s" % self.cached_m2m_field)
-            yield obj
-
-
-class ProposalManager(models.Manager):
-    def cache_m2m(self, m2m_field):
-        return CachingM2MQuerySet(self.model, using=self._db, m2m_field=m2m_field)
-        AdditionalSpeaker = queryset.model.additional_speakers.through
-        additional_speakers = collections.defaultdict(set)
-        for additional_speaker in AdditionalSpeaker._default_manager.filter(proposal__in=queryset).select_related("speaker__user"):
-            additional_speakers[additional_speaker.proposal_id].add(additional_speaker.speaker)
\ No newline at end of file