It's usually somewhere between a month and every couple of months from my experience, and usually half a dozen to a dozen people show up.
That said, I'm up for meeting this month, is anyone else?
I propose Sunday, Sept. 23rd @ 1pm in Green Lake Park (7201 East Green Lake Dr N, Seattle, WA 98115). If the weather isn't too bad, we can meet outside, otherwise we can meet inside the community center.