September 17th, a Friday. The premise is to turn a parking space into a park, or whatever your imagination can turn a 9'ish by 18'ish curbside space into. From their website, the goal is to:
make PARK installations honest gestures of generosity and civic engagement, and to support creativity, cultural expression, socializing and play. PARK(ing) Day is about offering the casual passerby a place to just sit, relax, casually interact with folks, or just sit and do nothing.
There are instructions for how to make your own PARK, and maps to facilitate PARKing tourism. Check it out!