You could also say why are so many who are gender critical and believe in women's sex based rights dont organise anything.
I did actually search (as opposed to images via a news feed) for images from local events and / or organised by autonomous groups, but didn't find any. Appreciate some may only have been shared on local media.
But taking into account that MSM has decided what to publish and what not, it is a reflection of a strand of feminism that seems to have quite populat support.
Since Third Wave feminism, which wasn't just restricted to universities in the US and UK, many women now believe that feminism does support "sex work" and that TWAW.
That's the issue - and the need for FWR!
Maybe by this time next year FWR could organise an IWD event to make a public display of how many women are not part of the rainbow band wagon.