Folsom Street Fair in San Francisco
Folsom Street Fair takes over San Francisco's South of Market district each September, widely described as the world's largest leather and fetish street event. Founded in 1984 amid the neighborhood's leather bar community and the early years of the AIDS crisis, it has grown into a major fundraiser for LGBTQ and HIV and AIDS-related charities while retaining its adults-oriented, leather-community roots.
Its scale and distinct subcultural identity make it a genuinely unique public event.