diff --git a/mod/workshop/lib.php b/mod/workshop/lib.php
index 73d05e2e40e..ee3404e24cc 100644
--- a/mod/workshop/lib.php
+++ b/mod/workshop/lib.php
@@ -1846,6 +1846,11 @@ function mod_workshop_core_calendar_provide_event_action(calendar_event $event,
 
     $cm = get_fast_modinfo($event->courseid)->instances['workshop'][$event->instance];
 
+    if (!$cm->uservisible) {
+        // The module is not visible to the user for any reason.
+        return null;
+    }
+
     return $factory->create_instance(
         get_string('viewworkshopsummary', 'workshop'),
         new \moodle_url('/mod/workshop/view.php', array('id' => $cm->id)),
diff --git a/mod/workshop/tests/lib_test.php b/mod/workshop/tests/lib_test.php
index b52404d84b8..f2cd1b9f67c 100644
--- a/mod/workshop/tests/lib_test.php
+++ b/mod/workshop/tests/lib_test.php
@@ -56,6 +56,32 @@ class mod_workshop_lib_testcase extends advanced_testcase {
         $this->assertTrue($actionevent->is_actionable());
     }
 
+    /**
+     * Test calendar event provide action open for a non user.
+     */
+    public function test_workshop_core_calendar_provide_event_action_open_for_non_user() {
+        global $CFG;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        $now = time();
+        $course = $this->getDataGenerator()->create_course();
+        $workshop = $this->getDataGenerator()->create_module('workshop', ['course' => $course->id,
+            'submissionstart' => $now - DAYSECS, 'submissionend' => $now + DAYSECS]);
+        $event = $this->create_action_event($course->id, $workshop->id, WORKSHOP_EVENT_TYPE_SUBMISSION_OPEN);
+
+        // 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();
+
+        $factory = new \core_calendar\action_factory();
+        $actionevent = mod_workshop_core_calendar_provide_event_action($event, $factory);
+
+        // Confirm the event is not shown at all.
+        $this->assertNull($actionevent);
+    }
+
     /**
      * Test calendar event provide action closed.
      */
@@ -78,10 +104,33 @@ class mod_workshop_lib_testcase extends advanced_testcase {
         $this->assertTrue($actionevent->is_actionable());
     }
 
+    /**
+     * Test calendar event provide action closed for a non user.
+     */
+    public function test_workshop_core_calendar_provide_event_action_closed_for_non_user() {
+        global $CFG;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        $course = $this->getDataGenerator()->create_course();
+        $workshop = $this->getDataGenerator()->create_module('workshop', array('course' => $course->id,
+            'submissionend' => time() - DAYSECS));
+        $event = $this->create_action_event($course->id, $workshop->id, WORKSHOP_EVENT_TYPE_SUBMISSION_OPEN);
+
+        // 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();
+
+        $factory = new \core_calendar\action_factory();
+        $actionevent = mod_workshop_core_calendar_provide_event_action($event, $factory);
+
+        // Confirm the event is not shown at all.
+        $this->assertNull($actionevent);
+    }
+
     /**
      * Test calendar event action open in future.
-     *
-     * @throws coding_exception
      */
     public function test_workshop_core_calendar_provide_event_action_open_in_future() {
         $this->resetAfterTest();
@@ -102,10 +151,33 @@ class mod_workshop_lib_testcase extends advanced_testcase {
         $this->assertTrue($actionevent->is_actionable());
     }
 
+    /**
+     * Test calendar event action open in future for a non user.
+     */
+    public function test_workshop_core_calendar_provide_event_action_open_in_future_for_non_user() {
+        global $CFG;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        $course = $this->getDataGenerator()->create_course();
+        $workshop = $this->getDataGenerator()->create_module('workshop', ['course' => $course->id,
+            'submissionstart' => time() + DAYSECS]);
+        $event = $this->create_action_event($course->id, $workshop->id, WORKSHOP_EVENT_TYPE_SUBMISSION_OPEN);
+
+        // 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();
+
+        $factory = new \core_calendar\action_factory();
+        $actionevent = mod_workshop_core_calendar_provide_event_action($event, $factory);
+
+        // Confirm the event is not shown at all.
+        $this->assertNull($actionevent);
+    }
+
     /**
      * Test calendar event with no time specified.
-     *
-     * @throws coding_exception
      */
     public function test_workshop_core_calendar_provide_event_action_no_time_specified() {
         $this->resetAfterTest();
@@ -125,6 +197,30 @@ class mod_workshop_lib_testcase extends advanced_testcase {
         $this->assertTrue($actionevent->is_actionable());
     }
 
+    /**
+     * Test calendar event with no time specified for a non user.
+     */
+    public function test_workshop_core_calendar_provide_event_action_no_time_specified_for_non_user() {
+        global $CFG;
+
+        $this->resetAfterTest();
+        $this->setAdminUser();
+
+        $course = $this->getDataGenerator()->create_course();
+        $workshop = $this->getDataGenerator()->create_module('workshop', ['course' => $course->id]);
+        $event = $this->create_action_event($course->id, $workshop->id, WORKSHOP_EVENT_TYPE_SUBMISSION_OPEN);
+
+        // 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();
+
+        $factory = new \core_calendar\action_factory();
+        $actionevent = mod_workshop_core_calendar_provide_event_action($event, $factory);
+
+        // Confirm the event is not shown at all.
+        $this->assertNull($actionevent);
+    }
+
     /**
      * Creates an action event.
      *