As Christopher F. Schuetze notes, "The event, which was first celebrated in 2005, started life as a public project of a small art and design studio in San Francisco. Today it is being held on six continents in cities from Manchester, England to Jakarta, Indonesia to Leipzig, Germany to Toronto, Ontario and many cities in between." If you're looking for where you can find a parklet near you, check out the user generated map accompanying the article.
If you live in Los Angeles, the LA Times, has put together a handy guide to some of the city's highlights, including: "The Sun-Bedazzler" in West Hollywood and "Parkside Confessionals" in Culver City.