Open-water swimmer Catherine Breed will celebrate the end of her 900-mile swim down California's coast at a free gathering in Coronado on Wednesday, Oct. 21.

The event starts at 4 p.m. in the public parking lot at Stan's Beach near the Coronado Shores, according to the Coronado Times. Breed, 33, is believed to be the first person to complete a staged swim of the state's full coastline. Formal ratification is subject to review of supporting records, the Coronado Times reported. It is the final community stop of Swim California, Breed's expedition down the Pacific coast. Tickets are free through Eventbrite.

Coronado City Council Member Amy Steward will speak at the gathering, along with Breed and Anne Middleton, associate director at WILDCOAST, the coastal conservation nonprofit hosting the event.

Breed, a Mill Valley resident and former UC Berkeley swimmer, left the Oregon border on July 1 and swam south in stages. A crew aboard a 52-foot sailboat accompanied her. A pacer tossed her protein shakes in a thermos for fuel. GPS waypoints linked each day's swim to the next, and observers documented her progress, the San Francisco Chronicle reported.

She averaged more than 10 miles a day, passing the Golden Gate Bridge, the kelp forests of Monterey Bay and Big Sur before rounding Point Conception and pushing through Southern California, according to the Chronicle. She had expected to reach the Mexican border in November but finished ahead of schedule.

The expedition doubled as an ocean-conservation campaign. Breed founded Sea Dreamers, a nonprofit that connects women to the ocean through adventure, education and community. At each coastal stop she partnered with a local environmental group. In Santa Barbara on Sept. 24, about 120 people turned out to hear her speak alongside Santa Barbara Channelkeeper, the Santa Barbara Independent reported.

In Coronado, the partner is WILDCOAST, which works on coastal and marine conservation through science and community engagement. Breed said she looks forward to sharing the journey with the San Diego community and learning more about WILDCOAST's work, according to the Coronado Times.

The swim's final miles brought Breed face-to-face with the sewage pollution that South County residents know well. KPBS reported on Oct. 16 that Breed would have to navigate contaminated waters off Imperial Beach and Coronado from cross-border sewage flows.

"It's just heartbreaking that there's a beach in California that the people that live in that area can't go to and stay safe and stay healthy," Breed told KPBS.

SwimSwam reported Breed completed the swim on Sunday, Oct. 18. The Santa Cruz Sentinel reported she finished her final 2.5 miles on Monday, Oct. 19. The accounts differ on the exact completion date.

The event is free. Residents can register on Eventbrite or show up at the Stan's Beach parking lot at 4 p.m. Wednesday.