The Horror Society will celebrate its one-year anniversary Saturday with the Zombie Disco Party at the Viaduct Theater. “It’s to celebrate the Horror Society being in Chicago and doing events for the past year,” says Mitchell Wells, who heads up the Society. Tickets are $10 and can be purchased at the door or online. The Horror Society started four years ago as just a Web site. “It was just a bunch of friends talking about horror movies-mostly independent films nobody’s ever heard of,” Wells says. Gradually, the society grew to its current calendar of events, parties and film festivals every couple months. Guests are invited to come dressed as zombies or get decked out on location with the help of makeup artists and then compete in the “best zombie” costume contest. Wells says the party will include vendors, games, screenings of old horror films, a DJ, drink specials and plenty of disco. “Everybody likes disco,” he says, “whether they admit it or not.”