Chicago River dyeing for St. Patrick's Day

 https://www.nbcchicago.com/news/local/chicago-river-dyeing-2024-guide-when-it-takes-place-who-dyes-it-how-long-it-lasts-and-more/3383597/

It's always a nice effect.

https://www.timeout.com/chicago/things-to-do/dyeing-of-the-chicago-river

https://www.usatoday.com/story/news/nation/2024/03/15/watch-dyeing-chicago-river-green/72975103007/

https://urbnexplorer.com/2024/02/13/the-secret-behind-dyeing-the-chicago-river-green/