It's almost summer in San Francisco, meaning that the city's schedule of street fairs and festivals is about to swing into full gear. Events range from the very family-friendly Union Street Festival in Cow Hollow to the decidedly no-kids leather and fetish Folsom Street Fair. No matter the occasion, each of the festivals is about celebrating the city, its neighborhoods, and the distinct places and people that make up San Francisco. We've mapped 41 festivals and fairs around the city and included the dates that they will next be held. Have a favorite festival that we missed? Let us know in the comments after the jump.