The winner will be announced around 11:30 a.m., but the rally in Daley Plaza will begin at 9 on Friday morning.
Chicago's Shedd Aquarium will also broadcast the announcement in the galleries. Children ages 3 to 11 who come dressed as their favorite Olympian or wear Olympic gear will receive free admission. The Shedd will give away wristbands to some attendees.
Also, on Monday, Dunkin Donuts will give away free medium coffees. The offer will be good even if Chicago does not win the bid.
Dunkin Donuts said it's the company's way of saying 'thank you' to the city for all of its hard work in showcasing the city.