There's a con in Boise, ID too, but it's not as purely anime as Kumoricon/Sakuracon/AnimeEvolution. I don't mind that, 'cause I just go for the gaming, but other people might not be as cool with it or something. I dunno.
There are plenty of cons to go to. I'm sure there's stuff in Bend, Spokane, Olympia, Eugene, and Victoria as well; you just have to look harder.
Anyway, my aftermath of Kumoricon:
Monday (began at 5pm) - went home, made a bookshelf, ate a boca burger, internetted, slept
Tuesday - Woke up, laid floors, internetted, slept
Wednesday - went to school, slept, to mom's, laid floors, went home, slept, internetted, slept
Thursday - went to school, went to friend's house, went to Aikido, went to Joe's Crab Shack, started math homework, slept
Friday - woke up on math homework, finished math homework, went to school, slept, went home, went to football game, went to dance, danced, left, internetted
Saturday - Slept, woke up, played Pokemon, went downtown, helped Dad with some moving, went to arcade, played DDR/GF/DM/JJ, went back to Dad's, ate pizza, watched some Ringo Starr, internetted.
And we then reach the present. Phenomenal.