"The question is must the NAACP allow the KKK to march in their parades. No, that is a civil parade and not a religious event, and as such, can tailor their member content to their message - basic first amendment law. Now, also the KKK is not a suspect class for discrimination under the civil rights laws of any community of which I am aware. On to the St. Pat's parade. They acknowledge that if they were a general civil event parade, they cannot exclude on the basis of a protected groups rights."

I think I almost have it. So you're saying that if the KKK had a parade on MLK Day (a la Skokie where the ACLU and the courts sided with their right to a parade despite their particular exclusivity) for example, they couldn't exclude the NAACP, since Blacks are suspect class for discrimination under the civil rights laws of almost every community. Did I get that right? This only works one way? Would this apply to other civic events, as well. If I sponsored a rally in Central Park, for instance, I couldn't be sure I could decide who could or couldn't speak if there were the possibility of a "suspect class", say the Log Cabin Republicans, becoming involved?

I assume that a celebration of a Saint's day by Catholics has a fairly legitimate right to be considered a religious expression doesn't it? I mean it would be different if we were discussing the Protestant Orangemen since Protestants as a rule don't celebrate any Saint's day. When I celebrate Valentine's Day, for example, it's a purely secular thing. Is there something like the Zipper trademark case where once a religious event is celebrated by everyone, it becomes secular?