Yes, City Nature Challenge 2019: Chicago Wilderness Region!
Here it is:
https://www.inaturalist.org/projects/city-nature-challenge-2019-chicago-wilderness-region
Hit "Join" in the top right corner.
Here it is:
https://www.inaturalist.org/projects/city-nature-challenge-2019-chicago-wilderness-region
Hit "Join" in the top right corner.