Add ‘hook_bat_api_events_index_calendar_alter’

bat_api.api.php

+<?php
+
+/**
+ * @file
+ * This file contains no working PHP code; it exists to provide additional
+ * documentation for doxygen as well as to document hooks in the standard
+ * Drupal manner.
+ */
+
+function hook_bat_api_units_index_calendar_alter(&$units) {
+  // No example.
+}
+
+function hook_bat_api_events_index_calendar_alter(&$events, $context) {
+  // No example.
+}

bat_api.module

@@ -931,6 +931,17 @@ function bat_api_services_events_index_calendar($unit_ids, $unit_types, $start_d
 
   $events_json = _bat_api_merge_non_blocking_events($events_json);
 
+  $context = array(
+    'unit_ids' => $unit_ids,
+    'unit_types' => $unit_types,
+    'start_date' => $start_date_object,
+    'end_date' => $end_date_object,
+    'event_types' => $event_types,
+    'background' => $background,
+  );
+
+  drupal_alter('bat_api_events_index_calendar', $events_json, $context);
+
   return array_values($events_json);
 }