Today MoMath celebrated the Pythagorean Triple comprised of the date: 8^2 + 15^2 = 17^2 with a math happening at South Lake Union. In case its not obvious: 225 folks in blue shirts lined up on one square and 64 in green on the other. We then all moved to the hypotenuse and confirmed the triple. I'm hoping someone took an aerial view that I can add later.
It included a very silly song they wrote to the tune of "Shut up and Dance with me": http://momath.org/about/pythagorize-seattle-song/
Here's my photos from the event. The last one's the triangle pub down by my office which apparently is really 8x15x17 meters.