Check out the blog post about the event by Pamela Fox from Google
The Google Wave Hackathon is November 21st, 2009.
This event will be hosted by Google at their offices in Cambridge, MA.
Please fill out the registration form if you plan on attending.
Please review the Preparation Guide before the event.
There are some additional Google Wave Resources which you might find helpful.
If you are unable to attend in person, video from the event will be streamed live.
Anyone in need of a Wave Sandbox account will be provided with one at the event. The sandbox environment is different than the public preview server and requires a separate account.