People take a selfie on Michigan Ave. during the holiday season in Chicago, the United States, Dec. 19, 2021. (Photo: Xinhua)

Two Christmas trees are seen on Michigan Ave. during the holiday season in Chicago, the United States, Dec. 19, 2021. (Photo: Xinhua)

Skaters circle the Millennium Park rink in Chicago, the United States, Dec. 19, 2021. (Photo: Xinhua)

A VW Beetle is seen on Michigan Ave. during the holiday season in Chicago, the United States, Dec. 19, 2021. (Photo: Xinhua)

The official Chicago Christmas Tree is seen during the holiday season in Chicago, the United States, Dec. 19, 2021. (Photo: Xinhua)

A couple pose for a photo with the official Chicago Christmas Tree in Chicago, the United States, Dec. 19, 2021. (Photo: Xinhua)

Large crowds flock to the State Street shopping district in Chicago, the United States, Dec. 19, 2021. (Photo: Xinhua)

A woman has her photo taken with a Christmas tree on Michigan Ave. in Chicago, the United States, Dec. 19, 2021. (Photo: Xinhua)