Index: indico/MaKaC/services/implementation/collaboration.py
===================================================================
--- indico/MaKaC/services/implementation/collaboration.py	(revision e9b1d74fe7131278d7fb8155d8c15609849ff2ea)
+++ indico/MaKaC/services/implementation/collaboration.py	(revision 1d5dc6d613542af5bc6fee0cbea693ca92fffad5)
@@ -304,5 +304,5 @@
                     maxKey = self._params['toTitle'].strip()
 
-                """ For relative dates, create a diff timedelta for resetting to 
+                """ For relative dates, create a diff timedelta for resetting to
                     00:00 at the start of range and 23:59 at the end.
                 """
@@ -358,5 +358,6 @@
                               dateFormat='%a %d %b %Y',
                               page = self._page,
-                              resultsPerPage = self._resultsPerPage)
+                              resultsPerPage = self._resultsPerPage,
+                              grouped=True)
 
 class CollaborationCustomPluginService(CollaborationBase):