The Alma Heights Flea Market has been operated every year since 1973. This fundraising effort quickly became a large community event enjoyed by many from Pacifica and the surrounding towns. It has become a reunion event for former students, families, and friends. The number of vendors is usually about 100, and the school runs food concessions, a bake sale, a Scholastic Book Fair, and carnival attractions with bounce houses and similar activities for kids. It is a family oriented event.
Parking is available on site for customers, and usually 600-800 cars are parked during the day. Many guests also park along Linda Mar Blvd. and walk onto the campus. The number of shoppers and other guests is in the thousands.