Some anecdotal stuff as a UIC student. I know a lot of people who are protesting right now. When Trump first announced the rally, there was a petition to stop it that got something like 50k signatures. It got shut down because UIC is a public institution and can't really prevent any specific candidate from renting the Pavilion. Kids who had classes after 2-ish were emailing their professors, telling them that they wouldn't be in class. One of my friends got a reply, "See you there" from his teacher. I had a discussion at 2:00 and a bunch of the kids immediately left to attend the Sanders rally and protest.
There was a smaller pro-Sanders gathering in the quad at around 2:00. I was there for a little while, and left once the crowd started growing. I don't have any close friends who are at the protest (or at least, friends I can completely trust to help me if push comes to shove) since a lot of them commute and had to be back home. So I didn't go to the protest in case things get violent - I really needed a friend to be there for me. A good amount of my friends are the same. I mean, Chicago doesn't really have the best track record for non-violent protests
