The joining deadline is Thursday, 3 May. (The hard deadline is actually Saturday, 5 May, because that's artist/fic matching day, but this ensures I have time to get folks added. I make no promises that I'll be able to add anyone who asks after 3 May in time, though I will try.)
The art comm is currently set so that maintainers have to send invitations. (I could probably change it, but I don't want to mess about too much.) You'll therefore want to be sure you're getting notifications in order to receive the invitation. If you have any problems with this setup, please let me know and I'll see what I can do.
Please also spread the word to any other artists who may be interested!