Wikipedia Day NYC is an informal meetup and celebration hosted annually since January, 2010. The event is a commemoration of the founding of Wikipedia, as well as a mini-conference dedicated to Wikipedia and Free Culture related topics. Newcomers have always been welcome!
Wikipedia Day 2010 
Wikipedia Day NYC was a celebration that held on Sunday, January 24, 2010, at New York University and hosted by Free Culture @ NYU and Wikimedia New York City, and also joined by our friends with the eKindling Philippines OLPC group.
The event was on the 8th floor of the Kimmel Center at NYU (Washington Square South between Thompson and Laguardia/West Broadway) and the program ran from 1PM - 7PM.
The event was in commemoration of Wikipedia Day and the 9th anniversary of the founding of the Wikipedia site. We were especially happy to welcome newcomers and the interested public to the "Wikipedia world" with this event!
Wikipedia Day 10th Birthday Bash 
The Wikipedia Day 10th Birthday Bash was a celebration and mini-conference held on Saturday, January 15, 2011, hosted by ITP at NYU's Tisch School of the Arts, and also supported by Wikimedia New York City, Free Culture @ NYU and other Free Culture Alliance NYC partners. It was held at the NYU Tisch ITP building, located at 721 Broadway.
The NYC celebration was one of a number of Wikipedia 10 events ("Wiki X") held worldwide, commemorating the founding of the project in 2001.