The case study which counsel appears to have advised on resulted in an opinion which is full of other assumption s, of caveats , if you will: if this and if that condition applies then....
The main one is the premiss that the people attending all agree toi segregation. The trouble with that is that anyone who would like to hear the speaker, but who doesn't approve of segregation ,will be denied the opportunity of hearing the speaker. That cannot be in accordance with any university's principles; such meetings should be open to all. It would be otherwise if, for example, the university held meetings in the form of a synagogue service; there it is part of Jewish practice for men and women to be segregated; but I really can't see that happening. You can't declare a room a synagogue for a day, still less a mosque, I suspect.