It seems like most people have absolutely no idea how tickets to the NCAA tourney are obtained. I would imagine it's similar to when Spokane hosted the first round of the NCAA tourney.
Back in September, the citizens of Boise were given an opportunity to enter a lottery to obtain tickets for the NCAA tourney, and the lucky participants had the chance to buy tickets. The event was sold out long before anyone had any idea who would be in the tourney or playing in Boise. A small alotment is held aside for the schools, and that usually goes to the bands and the bigwig donors.
So, it's not going to be piles of Huskies fans, unless the citizens of Boise happen to like the University of Washington, or Seattle spawlers made the decision to travel to Boise and watch the game in September, when they had no clue who would be in. As for the rest of us, we either should have bought our tickets to Boise when we had no clue who would be in, get in good with the AD, or try the scalpers.