It can't matter how many women show, or none will show. It must be about getting together somewhere, socially, and 'lees being treated politely. Women AND men.
Or you could do it a different way. I've not yet seen a different way work, though.
Get munches going. Meet one another so you know who's working with you to organize a party-style event, privately, in someone's home, in a club or in a hotel room (or other rented space). Seek info on what's legal to organize (some locales in the world have archaic laws against shackles, for example, while others will allow no "beatings" and thus bastinado is illegal, etc.).
There's a very large group of you down there. Oh, and the West Coast Gatherings AND NEST both started with a woman involved. One. Start munches and meet her. Seriously.
It'll grow if you do the organizing. That takes time, effort and a certain amount of planning and organization. Go!