It's only been going a few years I think but I accidentally walked into the Million Women Rise rally last year and it was fascinating. Lots of messages from women round the world (including Afghanistan) who were getting out and protesting all on the same day, it was fab.
If anyone is in London it starts at 12 at Park Lane (Marble Arch tube, should be loads of banners and stuff i imagine), women and children only. More info on their website - I am nerdishly excited about this. Lots of women standing up and yelling together with tea and cake afterwards - it'll be like RL MN