Having just been to see the very enjoyable (but more Unknown Armies than CoC) Dave Made a Maze at Manchester's Grimmfest, I also saw the short film Call of Charlie - a neat little story about a dinner party etiquette with old friends, unexpected visitors and a Lovecraftian guest. Guess Who or What is coming to dinner. Some lovely subtle touches and lots of fun.
Link to the trailer here - with upcoming dates where it will be shown. It's only a short film, so the trailer is a bit spoilery. I think it's the kind of thing that the denizens of this forum would enjoy though.