An annual social gathering occurring on or around October 31st within the San Francisco, California metropolitan area, centered around themes of autumn, costumes, and often, elements of the macabre. These events range in scale from intimate private affairs to large public celebrations. Attendees commonly participate in activities such as costume contests, themed music and dance, and the consumption of seasonal food and beverages.
These seasonal festivities offer significant opportunities for local businesses in the hospitality and entertainment sectors, providing a boost to the regional economy. They also serve as a community-building exercise, encouraging social interaction and fostering a sense of place amongst residents and visitors. Historically, the city has a strong tradition of elaborate Halloween celebrations, attracting both local and international participation.