Mmm. It is one of those appealing but incredibly minefieldy ideas isn't it? They had a local Noongar guy give a "welcome to country" at a medical conference I went to recently, which was great, but local indigenous groups have a much stronger connection to (and interest in) medical services than fandom. I think there isn't quite a framework for incorporating the sorts of things you're talking about, but perhaps they should be (ie people come and talk about folklore/religion from various cultures. But then again, understandably, they might not like the idea of people inevitably going "Ooh! I could use that for a story!")

Personally I think we're probably better off trying to give more voice to the various marginalised POVs within fandom before we start inviting in outsiders. Like: anime panels with japanese fans on them. Or panels about cross cultural fandom with fans from non-english speaking countries on them.