The Montreal Massacre (unlike others ) is remembered every year as it is one of the 16 Days of Action Against Violence Against Women, but would agree that in media terms this mass shooting of women doesn't get the same coverage as violence against women as individuals.
And unfortunately, and not just because it is Canada, more of these events supposed to focus on women who experience male violence because of their sex are now colonised by men.
Which are the 16 Days and Why?
http://www.womensgrid.org.uk/?p=23273