Don't want to dominate this Jane - but...
I don't know where you are but some months ago women singers from the Goilín singing club in Dublin organised a workshop/discussion for women singers - 40 women turned up
This coming Sunday there is to be a meeting of women singers in The Cobbestone Pub in Smithfield Dublin

Frankie Armstrong is the person who springs to mind when the topic of women singers comes up - she set up classes to develop womens' voices
I have not enough information to know what Frankie is doing now but it's worth googling her name   
PLENTY MORE THAN THIS ON LINE
Jim