Indy Open 2013 the weekend of March 2nd and 3rd.
The event is a six round 64 person tournament using a win loss draw format. They will have over $2000 dollars in prize and are drawing some huge names from the 40K community considering it is only their second year running the event. Saturday is four games to determine fight for first on day two, and for those not still in the hunt for can play in a multitude of events including a three round RTT with brackets set up for players to play their peers based on the previous day's results. The only downside is that the event is 1750 rather than 1850, but that is a small detail in the long run.
Last I heard they had about twenty spots left, so if you are on the fence now is the time to buy them before others do!