Nan Desu Kan was a lot of fun... slightly bigger than Kumo is. Looking at their site, they claim 21k, but I
know they can't fit that many people into a hotel. I'm fairly certain they're triple-counting weekend attendees and that their unique person/badge count is closer to 7k.
I remember doing more Japanese culture panels (tea ceremony, Japanese food (yes, they actually fed you), etc). My sister also attended a cell painting panel which was pretty cool. Their opening ceremonies featured taiko drumming, though I've enjoyed K-con's opening and closing ceremonies better. Also, the AMV contest was slightly lackluster, but NDK doesn't have Guy - he really makes AMVs something spectacular
(could be different now since we went in 2007).
I love the building, and I wish we had something like it for Kumo.. It reminds me of the layout of most Embassy Suites, with all the hotel rooms around the outside of the building and open to a huge indoor courtyard all the way to the ground level. VERY cool to come out of your room and look down on the Artists Alley. Everyone also uses the balconies to hang their cloth wallscrolls. Even when you go back to your room, you're still right in the action
We've done the drive from PDX to C. Springs many times, and it's a solid 20 hours or so. The Little America signs in WY do get obnoxious after a while, but we're always so glad at that point to be close to Colorado. Truly, I hate driving through Idaho. We've broken down in that accursed state every third trip to CO.. no joke. Bring some good music, and if you have a buddy, it goes by faster. Lots of pocky
They must have changed the date... I thought I remembered it being in late August. Have fun! I'll be curious to see how you like it!