The spookiest month of the year has arrived and there's no better time to make the most of fall in Chicago. In October, you can cheer on tireless runners along the Chicago Marathon course, catch some at the Chicago International Film Festival or explore skyscrapers during Open House Chicago. It's also one of the best months for concerts, especially if you're a fan of Nine Inch Nails, Gorillaz or Christina Aguilera. And don't forget about beer festivals, Chicago Ideas Week, Bloody Mary Fest and tons of spooky Halloween celebrations. If you're looking for things to do in October, let us guide the way.