Dig out your Astoboy and put on your Pokemon ears. It's time to join the Tannery Series for a discussion of manga and anime, the Japanese cultural imports that have taken America by storm. You know? Soulful robots, gender-bending plot lines, punk-haired heroines and heroes with stars in their eyes? But “Manga Nation: Japanese Design and American Pop Culture” will go beyond the usual notions of cartoon and costume, fantasy and reality, to explore ideas about public and private selves and what the popularity of manga in the United States reveals about the changes in American identity. The program is slated for 6:30 to 9:30 p.m., Thursday, Nov. 21 at the Peabody Essex Museum, which has become something of a home away from home for the series, which was founded by Port residents Kirun Kapur and Dawne Shand three years ago and, naturally, got its start at the Tannery. The Peabody Essex brought the series into the PEM fold this year, saying the series represented cool cutting-e...