Hey, there's a hackathon happening on april 14th, looks like it'll be more like a web-app hackathon, but if you want to try hacking on that using ParenScript, CSS-Lite, Hunchentoot, CL-JSON, etc... :-P

You can sign up here:  http://guestlistapp.com/events/87969 

Not sure if I'll go, the APIs available look a little dull, no idea what you could do with them (APIs:, search engine metadata, ,, )

APIs:
Common Lisp libraries for Web API hacking:

-Rudolf O.