Haven't read the whole thread so some of what I say may already have been said or my 'facts' may be incorrect.
DH is a Mason. He is due to be Master the year after next, so I will have to host a Ladies' Night. He was dragged in by my father, as were my 2 BILs & a few family friends.
I am not keen. It costs DH around £400 per year for membership, then extra in terms of special 'uniform', a special briefcase, lunch before & drinks after the night (which I don't think are essential but DH apparently does
). It also takes up quite a lot of time - there are 4 meetings of their Lodge per year, each on a Friday night. They have to get there at 3pm, which for most people means leaving work at 2pm, so probably taking an afternoon of annual leave. For each of these meetings there are also 2 practice runs the weeks before, where they practice the words they have to say & the actions they have to do. I often have to help DH & my dad to memorise their words.
A couple of things I have been told: when they are initiated they have to bare their chest to prove they are a man, as females are not admitted. They also have to roll up their trouser leg so that it can be seen that they are not carrying a dagger in their sock.