Not this year.
I did it last year and had a great time. Didn't hit 50,000 until after the end of the month (it was about two weeks or so after), but I still enjoyed the experience. Helped silence the Inner Editor and let me vomit on paper. ("Brain vomit," as my Wife and I like to call it.) Anything I was missing, any bit of info I didn't have, I just made a note in the manuscript.
When scenes weren't flowing right because the Inner Editor kept saying "No, that wouldn't happen like that," I muzzled him and went stream of consciousness. Just wrote out what was supposed to happen in that scene. I'd fix it in revisions.
Missing a name for a secondary character? Just type "Mr. Guy." Fix it later.
But not for me this year.
To all those who are participating--good luck!