alter event status in trigger

[Nithya Natarajan]

Is it possible to alter event status in trigger?

I have created an event:
DELIMITER $$
CREATE EVENT `testdb`.`test_event`
ON SCHEDULE
AT CURRENT_TIMESTAMP
ON COMPLETION PRESERVE DISABLE
DO
BEGIN
CALL test_proc();
END$$
DELIMITER ;

Trigger:
DELIMITER $$
CREATE TRIGGER `testdb`.`test_trigger` AFTER UPDATE
ON `testdb`.`testtable`
FOR EACH ROW BEGIN
ALTER EVENT test_event ENABLE;
END$$
DELIMITER ;

But i got the following error while creating a trigger

Error Code: 1422
Explicit or implicit commit is not allowed in stored function or trigger.