I would suggest checking out Temple of the Four Winds up in Evanston (http://www.t4w.org/), but their ritual was last Saturday, the 13th (I've never been, but a friend said that he's heard their rituals are pretty 'silly' - No offense meant to anyone if you're affiliated with this group...). You could also try http://www.witchvox.com/ which is basically a neopagan news/networking site. I'm not sure if you'll find any covens celebrating this weekend though as they typically try to have their rituals on different days than the actual Sabbat. The reason for that is so the solitary practitioner can have their own thing. But I think creating your own celebration would be fun too, like nik suggested!