Syntax:
DROP EVENT [IF EXISTS] event_name

This statement drops the event named event_name. The event immediately
ceases being active, and is deleted completely from the server.

If the event does not exist, the error ERROR 1517 (HY000): Unknown
event 'event_name' results. You can override this and cause the
statement to generate a warning for nonexistent events instead using IF
EXISTS.

This statement requires the EVENT privilege for the schema to which the
event to be dropped belongs.

URL: https://mariadb.com/kb/en/drop-event/

