In their latest book, “Just Action: How to Challenge Segregation Enacted Under the Color of Law,” Leah Rothstein and her father, Richard Rothstein, explore the myriad ways in which community groups can work to address residential segregation. On Saturday, Oct. 7, Ms. Rothstein will come to the Dance Palace to discuss her new book and speak with Point Reyes Station activist Mary Morgan. “When I started writing this book with my dad, I wasn’t sure…