We have a vibrant developer community here in Seattle and sometimes cross-pollination is signal and sometimes it's noise. I hope the pointers below are signal :)
Tuesday: Github Drinkup (East Side)
Should be quite fun, with many of the participants in this year's Microsoft MVP Summit in attendance.
Wednesday: APIs & IPAs (West Side)
APIs and IPAs is a roadshow of happy hours being put on by Singly (they so auth/social APIs for apps) and co-sponsored by some local tech companies.
Sr. Developer Evangelist, Twilio Inc.