Difficulty: Moderately Easy
Step1
Investigate a good mystery. First make sure everyone's on the same page (as it were) as regards the definition of "mystery," and talk about some of the different subgenres: cozy, hard-boiled, holiday mysteries, mysteries where cats solve the crimes. Come dressed as Miss Marple, Sherlock Holmes or any other favorite sleuth.
Step2
Get swept away by romance. If you have members who turn up their noses at this genre, have them check into some of the different types such as paranormal, historical or time travel. There are even crossover science fiction and mystery romances, and a lot of "chick lit" takes a more humorous, even slightly cynical look at the conventions of romance. Dress as Scarlett O'Hara, a medieval maiden, or just wear your regular clothes as many romance novels take place in everyday modern settings.
Step3
Round up a posse of westerns. Encourage non-western fans to look for romances or mysteries with western settings, or perhaps western-themed science fiction or fantasy novels. There are even westerns told from the Native American point of view. Everyone will have fun dressing up and playing cowboys and cowgirls or maybe showing off some authentic Native American garb or jewelry.
Step4
Travel back in time with a historical novel. In addition to giving you tens of thousands of years of settings from which to choose, this genre will allow you to discuss the relationship between fiction and nonfiction. Would you consider your book to be primarily fiction with a little costume window dressing, or would you consider it to be a work of history made more readable by the introduction of fictional characters or dialogue? Costumes range all the way from cavepeople garb to, well, stuff you've had in the back of your closet since the '80s.