This week, Cynthia Nixon—star of “Sex and the City,” “The Gilded Age,” and, to many, the 2018 New York gubernatorial primary—makes her fourteenth Broadway début, in “Marjorie Prime,” at the Hayes. The play, by Jordan Harrison, centers on themes of family stories, aging, and memory (June Squibb, ninety-six, plays her mother), and, one recent morning, Nixon, a lifelong Manhattanite whose stage career began at fourteen, in 1980, went to the theatre district to reflect on some memories of her own. She headed from her home, in midtown, where she lives with her wife and two of their sons, to the subway, wearing a gray wool jacket, an autumnal plaid scarf, and a Wonder Woman backpack. Transferring to the 1 at Times Square, she admired a pair of subway-themed mosaics evoking…
