In general, this is a good thing to try in places where the community is presumably large enough.
This, like any group, will profit from having a face (who should be a woman, of course) to contact about it. As not-a-woman, one may be able to provide a convenient meetup location, or do some behind the scenes organizing, but during the actual event one should probably stay in the background if at all.
One factor in this of course is that you'll need to clarify for yourself, and for the invitees what you mean by women. People will wonder if they are included i... (read more)
Potentially, though this to me still sounds like an attempt to the definition down, or to leave some people out by being unclear. It would for example make an early-transition trans woman doubt if she is included, or a born-female nonbinary person who doesn’t think of themselves as particularly feminine.
We have not yet found a simple short phrase that includes everyone. I recommend explicitly listing who is included - again, if that is the intention. There are also groups that would like to not overinclude everyone. It feels better to communicate this directly than through such passive signage.