The deadline is March 15.
And, OK, here's the deal. I am enough of a realist to realize there will be late submissions. There always are. And if they're good, I would of course want to consider them; on the other hand, I do have to set some ground rules. SO. If you are planning to submit but think your submission might be late, email me to show me what you have so far by March 15. (Again, links only, no attachments. And include "LATE SUBMISSION" in the subject line, just as all full submissions should include "SUBMISSION" in the subject line.) No late submissions that I have not been informed of before March 15 will be considered. And the more advanced your piece is, the better chances it has.