PCFormat Magazine UK are holding an Obscurity tournament.

“Date: Thursday 29th October 7pm – 9pm

It’s dark out there. The evenings are creeping in, which means there’s never been a better excuse to play more games. Probably a good thing CoD4’s next Game Night is here, and since it lands near Halloween I’ve found a rather spooky mod for us to play…

If you can recall the situation that the marines found themselves facing during the original Predator film – before the franchise degenerated into silly alien deathmatches – and you’ll have a good idea what Obscurity Mod is all about. This mod sports a day-night cycle, a dynamic weather system and some pretty unusual weaponry and more (most of it gory).”
See the full description posted on the Obscurity Forums.