"Boston has its Marathon... Pamplona has the bulls... New Orleans has Mardi Gras...
San Francisco has the historic Bay to Breakers presented by craigslist 12k.
The 101-year old Bay to Breakers presented by craigslist 12k is one of the world’s largest and oldest footraces, held annually in San Francisco, California. The name reflects the traditional course which takes tens of thousands of participants from the northeast end of the downtown area near The Embarcadero (the "bay" side of the city) to the west end of the city and the "breakers" of Ocean Beach. The 7.46 mile (12 kilometer) race features world-class athletes in addition to costumed runners and 'fun-loving' folks out for a great day of running and walking through San Francisco."
Okay - Basically it's one huge shit show. (In all the right ways). For those in New Orleans, think Red Dress Run. It is technically a run, but many of the participants (including myself) see it as an excuse to dress up like idiots, start drinking at 7am, pAArty, and end the day (somewhere around 2pm) with a ton of food and then bed. Our group of 40ish's theme was cowboys and Indians...clearly. Obviously I woke up for just long enough to eat (again) and watch the Billboard Music Awards, but not much more than that. OMG it was exactly what I thought and so, so fun. Literally favorite day in San Francisco to date.