TRIGGER SYNTAX ERROR
MySQL said: #1064 - You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near 'EACH ROW BEGIN DECLARE new_event_id INT DEFAULT 1001;
Answer Answered by Ian Gilfillan in this comment.
You don't provide any information beyond the error message, but perhaps you have not used delimiters correctly?
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