Portland Area Open Source Geospatial User Group (PDX-OSGEO)
Local chapter of OSGEO, and an OR-URISA SIG
Meets monthly on the 3rd Wednesday shortly after 6:00 PM at various Portland area locations. No RSVP needed. All abilities and interest our welcome to attend. PDX-OSGEO is composed of members that include those that are geo-curious to überhackers. Monthly Meeting details are posted several days ahead on the Wiki under the meetings section. If a meeting is canceled or changed a post is normally made to the Google Groupl; so please check there for the most recent information and activity.
Google Group: http://groups.google.com/group/pdx-osgeo