Swallows Depart from San Juan Capistrano Day is celebrated on October 23, marking the mass migration of swallows to Argentina for the winter. This event is observed in San Juan Capistrano, California, where countless swallows flock to nest, particularly around the local church. Swallows are small, elegant birds characterized by dark-blue backs, white underparts, pumpkin-colored rumps, and light patches on their foreheads. People travel from various locations to witness the swallows' graceful flight and admire their beauty. The tradition is rooted in a legend involving Father St. John O'Sullivan, who provided sanctuary for the swallows after an innkeeper attempted to destroy their nests. This day highlights the connection between nature and community, celebrating the remarkable journey of these birds.