DURING MY DAYS in middle school in the rural Midwest, I accompanied my friend Beth to several of her father’s Civil War reenactments. Along with them, I learned how to sew my own costumes, frontload a musket, and fire a cannon. Thrilled by all this, I went on to join every reenactment enclave I could weasel my way into. Over the years, I have posed as a 19th-century explorer giving tours of Frenchtown with a terrible accent, taken a turn as a Victorian prostitute dragging tourists through a haunted brothel, and led Boston visitors down the Freedom Trail dressed in full colonial attire. Through it all, I came to learn the joys of what Zoe Fraade-Blanar and Aaron M. Glazer have dubbed “superfandom” — a mode of fervent, participatory cultural consumption. My flair for the corset and the bustle stood me in good stead as I read Ted Scheinman’s new book, Camp Austen , which chronicles the year and a half the author spent participating in, “accidentally” loving, and then leaving what he call...