Apparently we have around 40,000 people in Chicago!
I saw a lot of the signs listed above. One of my favorites was "alternative Facts are Fiction, just ask an English Major: English Majors for Science." (as I was an English major.) Another woman created what appeared to be large bee-shaped piñatas, and attached them to metal poles that were probably a good 10 feet high and wrapped in fake flowers. She had them attached to her body via some sort of harness and they floated above all of us. Awesome.
My sign read on one side, "The dinosaurs lived many years ago", with "many" crossed out (with the appropriate proofreading mark of course) and "millions of" written above it. Because I work in textbook publishing, and I was once told to change "millions of" to "many" in that sentence, as the book was destined for a red state and saying "millions of years ago" would negate creationism. True story. This was way before Trump; in fact I think it was during Bush the 2nd, and I shudder to think what they're going to make us do in books now.