A good example of San Francisco's penchant for public absurdity is the annual St. Valentine’s Day pillow fight at Justin Herman Plaza.Photograph: Ramsey Said/guardian.co.ukThe cathartic event transforms both the fighters and the onlookers into a laughing throng, enjoying the spectacle while a million white pillow feathers float in the night air.Photograph: Ramsey Said/guardian.co.ukIt's not a massacre but there's probably more than a few broken hearts being mended through this process.Photograph: Ramsey Said/guardian.co.ukThe Ides of March bring another only-in-San Francisco event, the wonderfully pointless Brides of March.Photograph: Ramsey Said/guardian.co.ukOn that day the downtown shopping district of Union Square is overrun by hundreds of wedding dress clad women (and men.) Photograph: Ramsey Said/guardian.co.ukThe only point of the event seems to be to celebrate silliness and to confuse the tourists.Photograph: Ramsey Said/guardian.co.ukThose locals who are more sports-minded might choose to attend the Bring Your Own Big Wheel race. Photograph: Ramsey Said/guardian.co.ukThis event features hundreds of costumed locals navigating plastic children’s tricycles down one of the city’s steepest and curviest streets. Photograph: Ramsey Said/guardian.co.ukOriginally held on San Francisco’s famous Lombard Street, the race has relocated to the less famous but more crooked Vermont Street. Photograph: Ramsey Said/guardian.co.ukWhile billed as a race, there are no trophies given or records kept. As one race organiser proudly stated, “There are no winners here, only losers.” Photograph: Ramsey Said/guardian.co.ukOctober brings the Mission District’s Dia de los Muertos celebration.Photograph: Ramsey Said/guardian.co.ukDia de los Muertos is San Francisco’s take on the Mexican tradition of honouring the dead on All Saints Day.Photograph: Ramsey Said/guardian.co.ukThousands take to the neighborhood streets in a night parade.Photograph: Ramsey Said/guardian.co.ukThe marchers, most with their faces painted as skeletons, walk through the Mission District carrying candles, flowers and photos of the departed.Photograph: Ramsey Said/guardian.co.uk