The inaugural event seemed to go well last year, so let's do it again!
Presidio Park
Wed. August 12, 2015
12noon - 1:00pm
We'll meet at the tables under the pine trees. Bring your own food -- a sack lunch, take-out, something to share(?), whatever you like. Or just come to socialize. We can trade TBs and talk story. Unfortunately I'll need to get back to work after an hour or so, but you're welcome to stay as long as your heart desires.
GZ is a pleasant location with picnic tables, ample shade, and a good-sized, gently-sloping grass area suitable for soccer, bocce ball, frisbee, or croquet (bring your own toys). Great for kids and dogs (on a leash). There are various other caches in the vicinity for your searching and finding amusement. Heck, you could even get married here! 
Parking available on-street nearby (Cosoy Way) or at the Presidio itself.