I doubt I'd start one. It's too short a period for me to finish in time with my slow writing style. I'd love to read a few and might even toss in a couple of chapters if one catches my fancy though
Check out Spooky Scary Sisters. Several of us are writing 'scary' stories on there with different styles and kinks. Be warned that it's all incest.
I am trying my hand at writing a Halloween story. Sarckle's Spooktacular: Monsters in the Park I don't have much up right now, but I'm about ready to post the first scene. (hopefully later today)