^^^^
I'll be there much of the time manning an enormous LEGO display with some friends; it will be interesting to see how their numbers hold up. I agree that it seems like it's too soon and a cash grab by the organizers. I also think there's some kind of pent-up demand for that kind of geek culture event in Utah/mountain west that drew so many people in September.
I really don't think twice a year is sustainable. If it is, good for them, good for the downtown economy (I hope). Anecdotally, a lot of the people I talked to last year were from out of state, including a large contingent from Texas (?) who simply came because the guests were that big of a draw. I can see the one in a few weeks drawing big crowds for the entire Star Trek: The Next Generation crew (save Patrick Stewart)

, in a panel moderated by William Shatner. And yeah, it's an extra hundred bucks, for for True Devotees, it'd be worth it.
Not me. I'll be playing with LEGO.
Sigh.