SantaCon

Don a red suit and join the flood of boozy, boisterous Santas overtaking the city. Part flash-mob, part bar-crawl, the annual event—which all started in San Francisco in 1994—kicks off in Union Square before diverging into bar-hopping parties throughout the Castro, Lower Haight, SoMA and Mission. Union Square, Geary St at Powell St. Dec 12 noon. Free.