They need to get the case through the administrative level as soon as possible (because they are going to lose anyway) so they can appeal the final decision in the Courts. We need to get this issue up the judicial ladder ASAP. There is a clear differentiation between refusing to serve an event out of freedom of speech and religion and refusing to serve any given individual out of discriminatory bias. This is the hill to die on.
I disagree. So let's say the event were "African American Sounds of Africa Festival", an event that promotes animistic tribal religions (Voodoo) that are anathema to Christians. Very analogous issues at play. Do you really think this case would also be a winner? You can pretend the issue would be decided on the basis of freedom of speech and religion, but it would in fact sweep those issues aside and be decided on the basis of civil rights and public accommodation. When we accepted the civil rights act of 1964, which was the first unconstitutional curtailment of free association in the US, all of this was certain to follow. If the government has the authority to force a man to make his property and services available to a preferred class of people against his beliefs and will, then you can extend the principle to any other preferred class.