Hi,
The project page for coordinating online and offline events for International Women's Day (March 8) and Women's History Month has been published on Meta at: https://meta.wikimedia.org/wiki/Women%27s_History_Month-2016
The theme of the edit-a-thon this year on the English Wikipedia is Women in STEM. The theme covers various sub-domains like Women in Tech, STEM conferences, STEM opportunities and initiatives for women etc. This year the edit-a-athon would take place during a weekend, March 26-27, 2016.
I urge various language editors to add lists of articles to create and expand as a part of the edit-a-thon: https://meta.wikimedia.org/wiki/Women%27s_History_Month-2016/To_do_list