Secondhand Saturdays is a curated, stylish flea market featuring over 60 vintage vendors, makers, and artists, running monthly from April through November in San Francisco's Outer Sunset. Each event draws up to 4,000 sustainably minded attendees, part of Sunset Mercantile's broader 200,000-plus annual attendee footprint that reaches roughly 6 million digitally. The crowd is 52 percent female, drawn to fashion, home decor, community, and music, with a strong sustainability bent, and Sunset Mercantile's events overall pull 40,000-plus social followers and nearly 49,000 yearly website visitors. Beyond the monthly market, companion events like surfing celebrations, record swaps, and workshops give brands ongoing, low-friction ways to connect with seasonal, sustainability-focused audiences in the Outer Sunset.