At the very bottom of the page:

    June 1: signup
    June 24: development begins
    Sept 30: contest ends
    Oct 7: winners announced 

So, signup period is June 1 to June 24.. I guess

sorry about this. i think the HN post caught us slightly off guard. we'll have more details real soon now.

When are you going to give up the capitalized acronym LISP? It has the same archaic vibe and makes you want to code in it as much as in FORTRAN. Just call it Lisp.

The language name is actually "lisp", it's the enlightened converts' enthusiasm that causes them to shout it from the treetops. One would guess.