Reader Kathleen Creegan Damaskos tells GlobeWatch she’s worried that when winter snows come, they will make some already unsafe sidewalks near Chinatown even more treacherous for pedestrians. “The sidewalks along Avenue de Lafayette in the Downtown Crossing area between Chauncy Street and Kingston/Essex Streets have numerous large pits that, at one time, may have been covered with metal grates for planted trees,’’ she said. “It seems likely that these pits may become hidden under a layer of snow’’ presenting a danger, she said.