Well, maybe. NT Byelaws are an easy target, especially if applied in a jobsworth fashion. On the other hand, it would have been no trouble to ask for and get permission (maybe they did). And the big thing is, if they HAD been Nazis they wouldn't have got it.

I'm still wondering why they held their ceremony there, which has zero odinist connections, and not at the very nearby locations that have associations with Woden. People who dress up and worship mythical Norse gods are running enough risk of being thought daft without choosing the wrong place and the wrong day.