That is a good question! When I notified them about his views on Iraq, (he wrote an article calling for the US to be defeated) as well as abortion and homosexuality, they still went ahead.
I am working to find out whether or not he will be financially compensated and whether the priests and bishop know about his views.
Contact some well known lay and clerical Catholics so they can also publicize this news to their readers and/or parishes . I am thinking of John Neuhaus at First Things, George Weigel, Bishop Chapute of Denver, Amy Welborn, Bishop Burke and other Catholics who do not brook nonsense like the invite to this speaker. You might also get in touch with the local Knights of Columbus.