Excellent list, Greg! I think Block Party is way more fun than GeoWoodstock. I've been to all the BP events plus the Ape Cache event and still love attending. There is so much to do in the Seattle area.
The only thing I would add is to get in line early to buy t-shirts and stuff from Groundspeak and THEN do all the other things. They sell out fast and the line gets very long. The lab caches were available before the Block Party started so you can wander the area and cache while they are setting up the booths.