Having had a look at the Enola Gaye website, they seem to sum it up pretty well themselves:
Using Enola Gaye products or any type of pyrotechnic in a public places where you may induce worry or panic is illegal. It is not illegal to own or use pyrotechnics but they need to be used away from the general public or face potential prosecution by public disorder.
That said, if you approached the university with an appropriate risk assessment and got their permission, that would probably be acceptable. You may be better off with a smoke machine, as this would offer a much more controllable effect, e.g. setting off a smoke bomb and then realising it's producing much more smoke than you expected for the environment you're in, or the wind conditions, doesn't really leave you a lot of options.