I'll start coordinating things and reach out to various Lisp communities soon. In the meanwhile, if you're interested in any language or project under the Lisp umbrella and plan to be at 38c3, get in touch, it'd be great to hear from you.
If you're not planning to attend Congress but would still like your Lisp project to be somehow part of the assembly, also feel free to reach out and we can discuss.
/end