WordPress add a rewrite rule to a page to accept a GET variable

Since ‘submission‘ is a child page of ‘events‘, the rewrite rule should include the parent path

add_rewrite_rule('events/([^/]*)/submission/?', 'index.php?pagename=events/submission&epl=$matches[1]', 'top');

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)