2008-08-28 47 -122
This geohash is on a wooded hillside near Sammammish, across the street and north of this house.
Couldn't get Harlequin out of bed for a 9am attempt, so went solo. Location appears to be just off NE 6th St. in Sammamish, but it turns out to be a private road with posted signs saying "End of County Road" and "Violators will be prosecuted." Closest approach 0.22 miles from location.
 Alternate expedition
Thomcat was there; movie started closer to 8:30 due to cloudy dark Seattle conditions. I didn't see anyone else, but I wasn't exactly holding an XKCD sign either.