Events aren't subject to max_connections, max_connections_per_hour, etc. They should be, otherwise a user can use events to bypass configured limits. In other words, every executed even should count as a connection and every query within the event should count as a query executed by that user (towards max_queries_per_hour and max_updates_per_hour.

this will also protect against too many connections executing at the same time and overloading the server.