Chicago always has the Magnificent Mile Lights Festival every year. I think this was the 50th annual.
This year they drew around one million people. I don't go because I get annoyed with all the crowds and kids, but it's always live on TV which I've seen once or twice. It's normally dozens of floats, marching bands, huge floodlights, Disney characters, etc. They light up over a million lights along 200 trees and buildings covereing Michigan Ave, followed by a large fireworks display on the Chicago River.