In all honesty I would say.
That if a trans man has had hormones and/ or surgery then the last place they want to be is in a workshop full of women. Surely that would be immensely uncomfortable for pretty much everyone. There's also the issue of not wanting to out yourself at work. My understanding is this is for employees.
Additionally if a trans man has had surgery / hormones then they will be under medical care around all sorts of things to do with their reproductive biology. They will be getting specialist advice. Or they really should be. And if they aren't, a workshop like this will be inappropriate as they will have very different and individual needs.
If a trans man has had no hormones/ surgery then a different story. Similarly for non binary females. Again I would say that it would not be comfortable for them to go to a session that will inevitably be very woman heavy.
The genuinely inclusive approach, considering all needs, would be to run two sessions.
One for women who would like information about the menopause.
One for transmen and non binary people who would like to know more about the menopause.
In fact for the sake of privacy and knowing the numbers will likely be low. I would email out saying would anyone who is trans or non binary be interested in a session about menopause. And see if there was interest and if so, be discreet about where/ when. I would offer individual sessions for this reason as well (cost allowing) and if not look into reputable orgs to signpost to.
The idea that it would be anticipated that anyone with a non woman gender identity would be comfortable going to an open menopause session seems unlikely to me.
And anyway the needs of that group could be more specialised.
So no. I don't want to exclude trans men. I want to make sure that everyone who might need the session, understands that it's happening and what it's about. And that trans people who may be interested are considered with the utmost sensitivity and not just lumped in as people who menstruate which would be an incredibly insensitive approach that I doubt would get them engaged.