On September 17, 2012 OWS celebrated it's one year anniversary/birthday since the movement began on September 17, 2011. They also shared this date with the Jewish holiday Rosh Hashanah, and the New Year, and celebrated it during a Mic Check event.
The 2012 event was mostly peaceful, but ows also face intimation and arrest by the NYPD, Zucotti Park was surrounded by dividers even though it was not suppose to be.
Other than these issues, the one year anniversary of Occupy Wall Street was a success, an estimated 50,000 people took part at one point. Until next year, best wishes OWS!