Democratic National Convention

Plenty of convention business and hobnobbing takes place in the lobbies, bars, and restaurants of the luxury hotels like the Four Seasons where attendees stay. "I was kind of surprised by the amount of grilled cheese we sold," says the chef of the hotel's restaurant, Adorn.

As Chicago gears up to host the Democratic National Convention, take a look back at a few historical images that document three previous DNCs held in the city.