Which is located at the crosshairs:
and since the specified date is two weeks from today, 9-Sep-2007, I went there to have a look around.
It's a little playground in West Cambridge, occupying a triangle of land
near where Cedar and Dudley streets
cross and just off Mass Ave. This is looking northeastish, along Cedar St
and into the park:
My immediate suspicion was that it involves the rods-and-balls structure
behind the slide, but I had to make sure.
I wandered around the park with the GPS, which at first didn't move from
where I had stopped
the car until I turned "road lock" off and then suddenly it started
following me around.
I gradually homed in on the object in question...
The location is indeed in the exact center of the jungle-gym.
Having confirmed this, I finished my wander and took off.
So clearly, one of these
as shown in http://xkcd.com/242/ ...
needs to be constructed and deployed there in advance of the given date and
time, when it seems quite plausible that many fans of the comic may suddenly
show up in this park. I won't be around because I'll be in
Pennsylvania
that weekend.
Upon further investigation it turns out that while it was fun to reproduce the location exercise for myself, this page is virtually useless, because an extensive thread on it appears to have started about this back in March:http://forums.xkcd.com/viewtopic.php?t=3497
with all kinds of other reference links sprinkled through it including a livejournal thread and other pop-culture-media sites. So who knows, it could be a quiet gathering, a mob scene busted up as "terrorism" by the cops, or nothing at all. I haven't gotten very far through the postings, and since learning that it's gotten the attention of 900+ Facebook subscribers and similar intertube gadflies, I'm not likely to finish.
_H* 070909