MySQL event scheduler waiting on empty queue since server restarted 12 days ago
The event_Scheduler is, as it's name suggests, a way to Schedule Events (in this case queries) to run in MySQL at a given time. It is simply waiting for an event to trigger it and tell it to do something. As you can see you have no events set up, so it will be waiting for a long time.
It is enabled by default, but can be disabled by running:
SET @@global.event_scheduler = 0;
You also want to add:
event_scheduler = OFF
to your my.cnf file to prevent it starting after a reboot.