"Her kids weren't there. Attendance at this event was voluntary and she did not want her kids going."
So, I suppose you wouldn't mind if, say, a school in Deerborn, MI hosted a radical imam for Jihad Awareness Day so long as it was voluntary? Or, perhaps if a school in Tyler, TX invited Jerry Falwell to teach on the eternal health effects of sodomy and fornication during its Abstinence Education Day.
Jeez, state schools have no business sponsoring this crap.
How about reversing it and demanding that the opposit view be given EQUAL time as part of their STATED diversity party.