What about a bounty tournament with a real buy in and money added to the pool? A lot of sites do stuff like that.
I'd also recommend toying with a late night tournament, rather than early morning or trying both and seeing which gets a higher turnout.. Keep in mind that not everyone is on the East coast and the first tournament is already at 10:00 am for those on the West Coast and that the last one is at 7:00 pm there, so they won't get any more Carbon games after that.