Inspired by a true story, this slight but charming and nicely balanced comedy tells the tale of a group of middle-aged women in a Yorkshire village who decide to pose nude for the dozen photographs in a fund-raising calendar. Working from a script by Juliette Towhidi and Tim Firth, director Nigel Cole keeps this from getting too cute or too broad. With Helen Mirren, Julie Walters, and Linda Bassett. PG-13, 108 min. (JR)