diff --git a/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitApiController.php b/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitApiController.php
index eae49288..035d6dd4 100644
--- a/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitApiController.php
+++ b/app/Http/Controllers/Apis/Protected/Summit/OAuth2SummitApiController.php
@@ -79,10 +79,17 @@ final class OAuth2SummitApiController extends OAuth2ProtectedController
     {
         try {
 
+            $expand    = Request::input('expand', '');
+            $fields    = Request::input('fields', '');
+            $relations = Request::input('relations', '');
+
+            $relations = !empty($relations) ? explode(',', $relations) : [];
+            $fields    = !empty($fields) ? explode(',', $fields) : [];
+
             $summits = [];
 
             foreach($this->_getSummits() as $summit){
-                $summits[] = SerializerRegistry::getInstance()->getSerializer($summit)->serialize(Input::get('expand',''));
+                $summits[] = SerializerRegistry::getInstance()->getSerializer($summit)->serialize($expand, $fields, $relations);
             }
 
             $response = new PagingResponse
diff --git a/app/ModelSerializers/SummitSerializer.php b/app/ModelSerializers/SummitSerializer.php
index 6aa1d5ee..95b3c9b7 100644
--- a/app/ModelSerializers/SummitSerializer.php
+++ b/app/ModelSerializers/SummitSerializer.php
@@ -27,8 +27,6 @@ final class SummitSerializer extends SilverStripeSerializer
         'Name'                        => 'name:json_string',
         'BeginDate'                   => 'start_date:datetime_epoch',
         'EndDate'                     => 'end_date:datetime_epoch',
-        'BeginDate'                   => 'start_date:datetime_epoch',
-        'EndDate'                     => 'end_date:datetime_epoch',
         'SubmissionBeginDate'         => 'submission_begin_date:datetime_epoch',
         'SubmissionEndDate'           => 'submission_end_date:datetime_epoch',
         'VotingBeginDate'             => 'voting_begin_date:datetime_epoch',
@@ -56,6 +54,13 @@ final class SummitSerializer extends SilverStripeSerializer
         'SpeakerAnnouncementEmailAlternateRejectedCount' => 'speaker_announcement_email_alternate_rejected_count:json_int',
     ];
 
+    protected static $allowed_relations = [
+
+        'ticket_types',
+        'locations',
+        'wifi_connections',
+    ];
+
     /**
      * @param null $expand
      * @param array $fields
@@ -70,6 +75,7 @@ final class SummitSerializer extends SilverStripeSerializer
         $values              = parent::serialize($expand, $fields, $relations, $params);
         $time_zone_list      = timezone_identifiers_list();
         $time_zone_id        = $summit->getTimeZoneId();
+        if(!count($relations)) $relations = $this->getAllowedRelations();
         $values['time_zone'] = null;
 
         if (!empty($time_zone_id) && isset($time_zone_list[$time_zone_id])) {
@@ -95,25 +101,31 @@ final class SummitSerializer extends SilverStripeSerializer
         $values['schedule_event_detail_url']   = sprintf("%ssummit/%s/%s/%s", Config::get("server.assets_base_url", 'https://www.openstack.org/'), $main_page, $schedule_page, 'events/:event_id/:event_title');
 
         // tickets
-        $ticket_types = [];
-        foreach ($summit->getTicketTypes() as $ticket) {
-            $ticket_types[] = SerializerRegistry::getInstance()->getSerializer($ticket)->serialize($expand);
+        if(in_array('ticket_types', $relations)) {
+            $ticket_types = [];
+            foreach ($summit->getTicketTypes() as $ticket) {
+                $ticket_types[] = SerializerRegistry::getInstance()->getSerializer($ticket)->serialize($expand);
+            }
+            $values['ticket_types'] = $ticket_types;
         }
-        $values['ticket_types'] = $ticket_types;
 
         //locations
-        $locations = [];
-        foreach ($summit->getLocations() as $location) {
-            $locations[] = SerializerRegistry::getInstance()->getSerializer($location)->serialize($expand);
+        if(in_array('locations', $relations)) {
+            $locations = [];
+            foreach ($summit->getLocations() as $location) {
+                $locations[] = SerializerRegistry::getInstance()->getSerializer($location)->serialize($expand);
+            }
+            $values['locations'] = $locations;
         }
-        $values['locations'] = $locations;
 
         // wifi connections
-        $wifi_connections = [];
-        foreach ($summit->getWifiConnections() as $wifi_connection) {
-            $wifi_connections[] = SerializerRegistry::getInstance()->getSerializer($wifi_connection)->serialize($expand);
+        if(in_array('wifi_connections', $relations)) {
+            $wifi_connections = [];
+            foreach ($summit->getWifiConnections() as $wifi_connection) {
+                $wifi_connections[] = SerializerRegistry::getInstance()->getSerializer($wifi_connection)->serialize($expand);
+            }
+            $values['wifi_connections'] = $wifi_connections;
         }
-        $values['wifi_connections'] = $wifi_connections;
 
         if (!empty($expand)) {
             $expand = explode(',', $expand);
@@ -229,6 +241,7 @@ final class SummitSerializer extends SilverStripeSerializer
                 }
             }
         }
+
         $values['timestamp'] = time();
         return $values;
     }
diff --git a/tests/OAuth2SummitApiTest.php b/tests/OAuth2SummitApiTest.php
index e0903ed2..1fb6bfab 100644
--- a/tests/OAuth2SummitApiTest.php
+++ b/tests/OAuth2SummitApiTest.php
@@ -18,7 +18,8 @@ final class OAuth2SummitApiTest extends ProtectedApiTest
     public function testGetSummits()
     {
 
-        $params = ['expand' => 'type'];
+        $start = time();
+        $params = ['relations'=>'none'];
 
         $headers = array("HTTP_Authorization" => " Bearer " . $this->access_token);
         $response = $this->action(
@@ -33,6 +34,9 @@ final class OAuth2SummitApiTest extends ProtectedApiTest
 
         $content = $response->getContent();
         $summits = json_decode($content);
+        $end   = time();
+        $delta = $end - $start;
+        echo "execution call " . $delta . " seconds ...";
         $this->assertTrue(!is_null($summits));
         $this->assertResponseStatus(200);
     }