diff --git a/mod/forum/lib.php b/mod/forum/lib.php
index 3e55a1562e7..6902ea7b1cd 100644
--- a/mod/forum/lib.php
+++ b/mod/forum/lib.php
@@ -6989,3 +6989,20 @@ function forum_grading_areas_list() {
         'forum' => get_string('grade_forum_header', 'forum'),
     ];
 }
+
+/**
+ * This callback will check the provided instance of this module
+ * and make sure there are up-to-date events created for it.
+ *
+ * @param int $courseid Not used.
+ * @param stdClass $instance Forum module instance.
+ * @param stdClass $cm Course module object.
+ */
+function forum_refresh_events(int $courseid, stdClass $instance, stdClass $cm): void {
+    global $CFG;
+
+    // This function is called by cron and we need to include the locallib for calls further down.
+    require_once($CFG->dirroot . '/mod/forum/locallib.php');
+
+    forum_update_calendar($instance, $cm->id);
+}