If you're thinking about picking a summer school run you'd better plan on working through Aug. 8, even though the last day of instruction is Aug. 2. That's what they had to do last year but didn't find out about it until the week before.
http://schools.nyc.gov/NR/rdonlyres/D2EDECC5-0E50-4A82-A275-460CF122AFCC/123099/SummerSchool2012Calendar.pdf