What professional development events or conferences are out there for CS educators? I'm trying to find a professional development event for myself as a relatively new CS educator. I'm interested in something that showcases innovative ways to teach and engage students in the subject -- any recommendations?

In particular, conferences for high school educators, and those that showcase new technology/tools for CS educators would be brilliant. I am based in the USA and am happy to travel to events.
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.