Since Ravenloft came out all those years ago, I've tried to do a special Halloween adventure in my campaigns.
In my current S&W OSR game, I took a 4e module from Dungeon called "The Ghost Tower" and retro-fied the adventure.
I posted the recaps at Carjacked Seraphim, my other blog.
Here are the links if you are interested:
A recap from the latest foray into CotMA will be up this week!