![bondage knot demonstration at the festival](http://upload.wikimedia.org/wikipedia/commons/thumb/b/be/Bondage_Knots_at_Folsom_Street.jpg/70px-Bondage_Knots_at_Folsom_Street.jpg)
Folsom Street Fair is an annual BDSM and leather subculture street fair held in September, that caps San Francisco's "Leather Pride Week". The event started in 1984 and is the world's largest leather event and showcase for BDSM products and culture. The event is organized as a non-profit, with gate entry fees and money from fundraising events going to charity groups. (Bondage knot demonstration pictured)