The catch is that all lists should be fluffy and are only allowed to repeat a unit once (so no Wave Serpent spam!).
I'm sure he will be taking some points from Blog Wars on how to run the tournament smoothly and there will be prizes for 1st, 2nd, 3rd, Fluffiest lists and Best Painted - although it will probably be worth going just to see Alex not stressing between games.
Unfortunately I wont be able to make it, but if you want to join in you can find more information here: http://fromthefang.blogspot.co.uk/2015/04/community-support-fluffageddon-sept-5th.html