diff --git a/mod/lti/lib.php b/mod/lti/lib.php
index edc18b38b69..b2366646ab0 100644
--- a/mod/lti/lib.php
+++ b/mod/lti/lib.php
@@ -652,11 +652,19 @@ function mod_lti_get_fontawesome_icon_map() {
  *
  * @param calendar_event $event
  * @param \core_calendar\action_factory $factory
+ * @param int $userid User id to use for all capability checks, etc. Set to 0 for current user (default).
  * @return \core_calendar\local\event\entities\action_interface|null
  */
 function mod_lti_core_calendar_provide_event_action(calendar_event $event,
-                                                      \core_calendar\action_factory $factory) {
-    $cm = get_fast_modinfo($event->courseid)->instances['lti'][$event->instance];
+                                                      \core_calendar\action_factory $factory,
+                                                      int $userid = 0) {
+    global $USER;
+
+    if (empty($userid)) {
+        $userid = $USER->id;
+    }
+
+    $cm = get_fast_modinfo($event->courseid, $userid)->instances['lti'][$event->instance];
 
     if (!$cm->uservisible) {
         // The module is not visible to the user for any reason.
@@ -665,7 +673,7 @@ function mod_lti_core_calendar_provide_event_action(calendar_event $event,
 
     $completion = new \completion_info($cm->get_course());
 
-    $completiondata = $completion->get_data($cm, false);
+    $completiondata = $completion->get_data($cm, false, $userid);
 
     if ($completiondata->completionstate != COMPLETION_INCOMPLETE) {
         return null;
diff --git a/mod/lti/tests/lib_test.php b/mod/lti/tests/lib_test.php
index 982a874b3b1..3db751da62e 100644
--- a/mod/lti/tests/lib_test.php
+++ b/mod/lti/tests/lib_test.php
@@ -159,6 +159,41 @@ class mod_lti_lib_testcase extends advanced_testcase {
         $this->assertNull($actionevent);
     }
 
+    public function test_lti_core_calendar_provide_event_action_for_user() {
+        global $CFG;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        // Create the activity.
+        $course = $this->getDataGenerator()->create_course();
+        $lti = $this->getDataGenerator()->create_module('lti', array('course' => $course->id));
+
+        // Enrol a student in the course.
+        $student = $this->getDataGenerator()->create_and_enrol($course, 'student');
+
+        // Create a calendar event.
+        $event = $this->create_action_event($course->id, $lti->id,
+            \core_completion\api::COMPLETION_EVENT_TYPE_DATE_COMPLETION_EXPECTED);
+
+        // Now, log out.
+        $CFG->forcelogin = true; // We don't want to be logged in as guest, as guest users might still have some capabilities.
+        $this->setUser();
+
+        // Create an action factory.
+        $factory = new \core_calendar\action_factory();
+
+        // Decorate action event for the student.
+        $actionevent = mod_lti_core_calendar_provide_event_action($event, $factory, $student->id);
+
+        // Confirm the event was decorated.
+        $this->assertInstanceOf('\core_calendar\local\event\value_objects\action', $actionevent);
+        $this->assertEquals(get_string('view'), $actionevent->get_name());
+        $this->assertInstanceOf('moodle_url', $actionevent->get_url());
+        $this->assertEquals(1, $actionevent->get_item_count());
+        $this->assertTrue($actionevent->is_actionable());
+    }
+
     public function test_lti_core_calendar_provide_event_action_already_completed() {
         global $CFG;
 
@@ -231,6 +266,47 @@ class mod_lti_lib_testcase extends advanced_testcase {
         $this->assertNull($actionevent);
     }
 
+    public function test_lti_core_calendar_provide_event_action_already_completed_for_user() {
+        global $CFG;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        $CFG->enablecompletion = 1;
+
+        // Create the activity.
+        $course = $this->getDataGenerator()->create_course(array('enablecompletion' => 1));
+        $lti = $this->getDataGenerator()->create_module('lti', array('course' => $course->id),
+            array('completion' => 2, 'completionview' => 1, 'completionexpected' => time() + DAYSECS));
+
+        // Enrol 2 students in the course.
+        $student1 = $this->getDataGenerator()->create_and_enrol($course, 'student');
+        $student2 = $this->getDataGenerator()->create_and_enrol($course, 'student');
+
+        // Get some additional data.
+        $cm = get_coursemodule_from_instance('lti', $lti->id);
+
+        // Create a calendar event.
+        $event = $this->create_action_event($course->id, $lti->id,
+            \core_completion\api::COMPLETION_EVENT_TYPE_DATE_COMPLETION_EXPECTED);
+
+        // Mark the activity as completed for $student1.
+        $completion = new completion_info($course);
+        $completion->set_module_viewed($cm, $student1->id);
+
+        // Now, log in as $student2.
+        $this->setUser($student2);
+
+        // Create an action factory.
+        $factory = new \core_calendar\action_factory();
+
+        // Decorate action event for $student1.
+        $actionevent = mod_lti_core_calendar_provide_event_action($event, $factory, $student1->id);
+
+        // Ensure result was null.
+        $this->assertNull($actionevent);
+    }
+
     /**
      * Creates an action event.
      *