The city of Boston is equipped with a wealth of historic neighborhoods, with districts ranging from the dazzling Back Bay to the ultra-Italian North End—but the Bay State charm doesn’t end once you hit the edge of the waterfront. East of the city’s coastline, the waters of Boston Harbor are peppered with idyllic islands, many of which sport fascinating forts and scenic landscapes. During the warmer months, visitors are welcome to hop on a ferry and explore the region, but in the dead of winter, there’s one fascinating event that’s particularly suited for both local and visiting birders.