You don't need to completely start the act over if you have an autosave or manual save from anywhere in Act Two - they're recruitable right up until the point that you trigger the Act Two finale :)
Laura happens automatically, Renee and Julie will call the living room phone on one of the days, I think, and Lucille can be found in the park on certain evenings. It's been over two years since I wrote the triggers so my memory is fuzzy :p
