The last day is 2nd Feb if you can make it.Just before you reach Sealine resort in Mesaaied,you will see signs on the road with directions to the place where this is taking palce.Follow the little Qatari flags staked in the ground.Its a couple of KM off-road.Nothing too crazy but u will need a 4X4.
BTW- this event was advertised a few times in Gulf-Times.So you did miss it :p