They cancel a simulcast of a conference because it's sponsored by Chick-Fil-A.
The conference is very benign. But it's sponsored by Chick-Fil-A, and that's enough to ban them.
From Ezra's column:
The problem, as councillor Jim Kipp said so succinctly, was that Chick-Fil-A has funded “a very strong unbelievable Christian belief” of being against same sex marriage, before referring to terrorists.