Create an assignment in a course Verify an event was created in the mdl_event table Modify the event in the database, setting the 'type' column to 1 Place the attached test.php file in the calendar directory Add the following to mod/assign/lib.php: function mod_assign_core_calendar_provide_event_action( \core_calendar\event $event , \core_calendar\action_factory $factory ) { return $factory ->create_instance( 'chef' , new \moodle_url( 'http://example.com' ), 3 ); } (If there is already a function with this name just comment it out and replace it with this one) Browse to yourmoodleinstance/calendar/test.php Verify the information you see matches what is in the database Verify the information added by the mod_assign callback is also present