Claims lists are available at both DW and LJ (but you only need to claim in one place).

Fest schedule:

May 11 - Fic and Art Prompt posts are open
May 25 - Prompt-claiming and sign-ups begin.
June 1 - The prompt-claiming and sign-up period ends
July 20 - All Fic and Art submissions are due (see this post for the Header template)
July 29 - Fest opens!
August 5 - Author/Artist Reveals

This entry is also posted at Dreamwidth. Comment at either location, as you prefer.