I think this is almost impossible to really do without some kind of metaphysical ingroup belief.

As someone without a religious bone in my body, it seems obvious this is what non-religious people have never really figured out how to do well.It is the achilles heel of the non-religious, rationalist.

The network almost needs to be based around some borderline ridiculous beliefs or it just ends up as a boring business networking cocktail party.

Burning Man is probably the best example of how to do all this well.