What professional development events or conferences are out there for CS educators?
In UK England, there are CAS Computing At Schools events. They are regional events. They are focused on primary and secondary schools. 

They are usually inspiring, but can be a bit simplistic if you have done programming for a job. The events I have been to I have ether chosen the groups that are teaching focused (as opposed to technical focused). Or in smaller events steered it towards teaching techniques. Each event has been multi-threaded (choose your thread), or small and adaptable.

You can sign-up to their e-mail mailing list, to be informed of events in your area.