While Shailene Woodley and Theo James were promoting “Divergent” at a screening in Atlanta on Monday, their costars Mekhi Phifer and Maggie Q were promoting the film in Boston. Phifer plays Max in the dystopian film. (“Divergent” fans will know Max as a “Dauntless.”) Q plays Tori, who figures out that Tris is Divergent. (Again, this will make sense to fans of the young adult series.) “Divergent” will be released March 21.Mark Shanahan can be reached at firstname.lastname@example.org. Follow him on Twitter @MarkAShanahan. Meredith Goldstein can be reached at email@example.com. Follow her on Twitter @MeredithGoldste.