I love the idea of people so enthralled by a particular subject that they form a subculture around it. Even more appealing to me is when they all look different (no visible hipsters here), are of different ages and demographic groups (they're not all South American!), and have completely different day jobs that couldn't be more far removed from the subject they're gathering around. Plus, the shameless, highly romanticized notion of virtual strangers gathering to learn how to tango in the Park is just priceless. *SIGH*, Summer in NYC...
http://www.nytimes.com/2007/08/25/nyregion/25summer.html?hp
