This thread has primarily been about women's spaces and the rights of biological females to define as a group. I didn't answer the question early about what it feels like to be a woman, because I can't think of any group that defines on the basis of a 'feeling' - trying to guess the internal feelings of strangers is a rather existential matter. When talking about group identity we generally base that sense of identity on either shared experiences or beliefs. In the case of biological females who want to identify as that, we are talking about shared experiences. Being a socialist, a Christian or a feminist is an identity based on belief. So I suppose the conference is based on people who share an identity based on both the experience of being biological females and who share an identity based on a belief in radical feminism. There are of course biological females who are not feminists and feminists who are not biological females, and other events exist for those groups. I don't see trans as being central to the content to this conference.
But the trans issue is important in other ways. Trans is one way of not conforming to the idea that constructions of gender have to be attached to a particular biological sex. But of course there are another two groups of people who have a history of gender nonconformity and defending the rights of people who do not conform to gender roles - gay people and feminists. And I suspect that is one of the reasons why this gets so heated, because the very people who are concerned with the same issue seem to be at odds with each other.
My family are now on our fourth generation of having some children who don't conform to gender, some much more so than others. And actually I don't know that; we could be on our tenth generation but I only know about the last four - some of whom simply would not conform. And we've all been pretty nonchalant about our children or siblings who did not conform. But I cannot say that if I had another child now, I'd know what to do. Because it isn't okay now to let children out of those restrictions, because let them out too far and there is a risk that somebody, some health or education professional or other person who holds a position of authority who knows your child, isn't going to let them out of that box because they have been 'trained' in transgenderism. And that isn't something you get to be nonchalant about; it is something that involves psychological tests, doctors, hormones, puberty blockers and surgery. And I worry for gender nonconforming children, and I worry that people who raise concerns about these issues, either because they're a doctor concerned about this or because they themselves belong to another gender nonconforming group are being banned and silenced. Most children 'diagnosed' as having gender dysphoria don't grow up to be transgender adult, but most of them do grow up to be gender nonconforming in another way (usually gay) and yet for some reason the only group who aren't being silenced on how these children should be 'treated' are transgender adults.