I'm missing this year's edition because of my month-long Roman sojourn, but I'm hoping that thunderstorms skip the city today. Some highlights: John Luther Adams's Inuksuit in Morningside Park at 5PM (my review of the indoor edition here); Yoko Ono's Secret Piece at sunrise; Julian Day, Luke Jaaniste, and Janet McKay's brass happening SWELTER on Central Park Lake (3:30PM and 5PM); Nick Franglen's Hymn to the Manhattan Bridge all day; Aaron Siegel and Larry Legend's iPhone project GROUP at 12:45PM on Wall Street; and Andriessen's Hoketus in the same place at 1PM. Enjoy!