Kate Nace Day and Alicia Foley Winn organized Human Rights & Sex Trafficking: A Film Forum, which opens this evening at the Brattle Theatre in Harvard Square to raise awareness about the issues. Tomorrow through Sunday, the forum will present 12 documentaries about international, cross-border, and domestic sex trafficking. The films will be followed by discussions of the subject by panels of experts, human rights activists, and survivors. The forum is presented by the Boston Initiative to Advance Human Rights, of which Winn, 30, is executive director. Day, 62, and Winn are both lawyers, and together teach a law school course at Suffolk University titled Sex Trafficking in Film and Law. Day is on the Suffolk law school faculty, Winn is an adjunct professor there.