Arianna Huffington, president and editor-in-chief of The Huffington Post, is coming to town to speak at the Boston Business Women Innovation Conference on May 9. Hundreds of female execs and entrepreneurs are expected to attend the event at the Westin Copley Place hotel to hear experts talk about money, personal branding, work-life balance, and other topics near and dear to women pursuing careers. Jenny Johnson, cohost of NESN’s “Dining Playbook,’’ will serve as the master of ceremonies, and featured speakers include the Globe’s Linda Pizzuti Henry; PR maven Colette A.M. Phillips; Self magazine editor in chief Joyce Chang; and Karen Kaplan, chairman and CEO of Hill Holliday.