That story says she was forced to leave, and the last line implies she could have been charged with something had security been willing to pursue it, presumably trespassing. Flooding an event with people to the point of violating safety code would presumably be disallowed for public events at any building in a country with said code.
Sure, I was starting with an extreme example to illustrate that not all public property is intended to be treated equally. If a person wants to hold an event on a walkway, I have no problem with others choosing to shout that person down. A reserved event inside a building where maintenance, travel, safety, etc considerations have to be taken into account is a different issue. What about any event held by a famous/expensive guest speaker, perhaps some big-name politician or philanthropist-CEO or something? Let's say Bill Gates or Mark Zuckerberg decided to speak at a campus, would you be OK if a couple hundred Windows-and-Facebook-hating, global-Zionist-conspiracy-fearing, smelling-of-semen-and-Cheetos 4chan users came over to drown it out?