Origins Grand Melee event

[bomholmm]

Okay I plan on going ot origins in columbus, and they have a grand melee listed on friday as one of the events wich I would love to play in.  But they do not have the deck construction format listed or the spell range or any real useful details about the event.  I have tried to contact all the supplied support people and have posted on the origins forums but I haven't recieved an answer from anyone.  If anybody on these forums knows what format the grand melee is in please let me know.