Yes, you can fish the Chicago River. I highly recommend fishing near the bridge pilings. Be aware the fish all have stunted noses. they bump up against the wall and it shortens there nose, at least that is the way it was explained to me.
I went up there for a week with my son about a decade ago. He took the bar exam and I fished the river. Lots of Bass, Bluegills and some Crappie to be caught. Enjoy your trip and the parade. The wife and I did the parade before Covid, it was a good time. The Chris Kringle market should be open and well worth a trip. They have all sorts of German Christmas decorations. There is parking in the mall across the street. It's an indoor mall, looks more like a high rise building than a mall.
HOI Crappie Club
Where family and friends come to compete for a little more than bragging rights.
Quick, someone teach me how to fish so I can win this tournament!!!