Not everyone can go and speak at a University, there is not enough time and space for that to be viable, just as not everyone can demand to be broadcast on TV.
If you can't get enough support at a University to speak, the public square and the soapbox are always at your disposal. The government can't arrest you. That is the freedom of expression that is protected.
You are talking about enforced speech, where private individuals must listen to a speaker, and/or use their platform to amplify the speaker's words. It is a violation of their freedom of expression to tell them they cannot refuse or protest against what someone else wishes to say.